The risk factors for rape: is sexual assault indiscriminate or are some women at greater risk than others? I speak with Carin Perilloux to find out. Also this month, can a conservative fall for a liberal, or is the bedroom a politics-free zone? And how exercising with the opposite sex bewilders your biochemistry.

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The Slut Walks that were held worldwide earlier this year demonstrate that advice about how women might avoid sexual assault is often unwelcome, especially if it focuses on changing women's behaviour. However, as Carin Perilloux told me in this month's interview, "it should be presented as 'here is all the information; you're educated women, you can make your own choices, you decide what you want to do.'" Listen in to discover more about Carin's research on the risk factors for rape.

The trailer for Politics of Love, a romcom set during the 2008 presidential campaign which is currently enjoying a very, very limited release. Coincidentally enough, political scientist Casey Klofstad published research this month suggesting that politics might be important for long-term couples, but that very few people advertise their political predilections when seeking a partner.

The articles covered in the show:

Felson, R. B., & Cundiff, P. R. (in press). Age and sexual assault during robberies. Evolution and Human Behavior. Read summary

Perilloux, C., Duntley, J. D., & Buss, D. M. (2011). Susceptibility to sexual victimization and women’s mating strategies. Personality and Individual Differences, 51, 783-786. Read summary

Miller, S. L., Maner, J. K., & McNulty, J. K. (in press). Adaptive attunement to the sex of individuals at a competition: the ratio of opposite- to same-sex individuals correlates with changes in competitors' testosterone levels. Evolution and Human Behavior. Read summary

Klofstad, C. A., McDermott, R., & Hatemi, P. K. (in press). Do bedroom eyes wear political glasses? The role of politics in human mate attraction. Evolution and Human Behavior. Read summary

How the roundness of a man’s face can predict whether he’s a liar, why testosterone fuelled men don’t like helping around the house, and how a woman’s fertility influences the warmth of her personality.

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Physiognomy used to be considered a pseudoscience, but it's now experiencing a resurgence, thanks in part to improved methods and a more rigid application of the scientific method.

The articles covered in the show:

Haselhuhn, M. P., & Wong, E. M. (in press). Bad to the bone: facial structure predicts unethical behaviour. Proceedings of the Royal Society of London B. Read summary

Pollet, T. V., van der Meij, L., Cobey, K. D., & Buunk, A. P. (2011). Testosterone levels and their associations with lifetime number of opposite sex partners and remarriage in a large sample of American elderly men and women. Hormones and Behavior, 60(1), 72-77. Read summary

Markey, P., & Markey, C. (in press). Changes in women’s interpersonal styles across the menstrual cycle. Journal of Research in Personality. Read summary

Does being attractive always help? We discover the social advantages that come with being slightly less than supermodel material. Also, do attractive people have attractive brothers and sisters, and where are all the female comedians? Do women prefer hearing jokes to telling them?

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Same-sex siblings, like the Kardashian sisters, tend to be similar in attractiveness. But what about opposite-sex siblings?

If you find the section on humour interesting, you might like this episode in which I interview Norm Li about his humour research.

The articles covered in the show:

Agthe, M., Spörrle, M., & Maner, J. K. (2011). Does being attractive always help? Positive and negative effects of attractiveness on social decision making. Personality and Social Psychology Bulletin, 37(8), 1042-1054. Read summary

Garver-Apgar, C. E., Eaton, M. A., Tybur, J. M., & Emery Thompson, M. (in press). Evidence of intralocus sexual conflict: physically and hormonally masculine individuals have more attractive brothers relative to sisters. Evolution and Human Behavior. Read summary

Wilbur, C. J., & Campbell, L. (2011). Humor in romantic contexts: Do men participate and women evaluate? Personality and Social Psychology Bulletin, 37(7), 918-929. Read summary

Satoshi Kanazawa's recent blog post “Why black women are less physically attractive than other women” has ignited a firestorm of protest across the web. In this special episode, we find out if his controversial claim stands up to scrutiny.

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In this special episode I talk with biological anthropologist Mark Shriver, Nanjala Nyabola, an Oxford graduate student who wrote a comment piece for the Guardian about Kanazawa's article, and psychologists Scott Barry Kaufman and Jelte Wicherts, who blogged about the controversy here and here and also reanalysed the original data. You can read Kanazawa's blog post here.

A graph from the reanalysis of Kanazawa's data by Wicherts and Kaufman, illustrating the lack of a difference in perceived attractiveness amongst women of different ethnic backgrounds (click to enlarge).

Is beauty in the eye of the beholder? We cast a glance at the pupil, iris and white of the eye, and discover that love is far from blind. Plus we find out how a roving eye can be good for your relationship.

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Provine et al. confirmed that a reddened sclera is less attractive than whiter-than-white whites of the eye, whilst Peshek and colleagues showed that a dark limbal ring (the narrow circle at the edge of the iris) also boosts your beauty. Modified from Joanna Malinowska/freestocks.org

The articles covered in the show:

Provine, R. R., Cabrera, M., Brocato, N. W., & Krosnowski, K. A. (in press). When the whites of the eyes are red: A uniquely human cue. Ethology. Read summary

Peshek, D., Semmeknejad, N., Hoffman, D., & Foley, P. (2011). Preliminary evidence that the limbal ring influences facial attractiveness. Evolutionary Psychology, 9(2), 137-146. Read paper

DeWall, C. N., Maner, J. K., Deckman, T., & Rouby, D. A. (2011). Forbidden fruit: inattention to attractive alternatives provokes implicit relationship reactance. Journal of Personality and Social Psychology, 100(4), 621-629. Read summary

How a higher pitched voice can make you sound more attractive, and suspicious. Also, war: what is it good for? We investigate the link between warfare and sex. And how do our hormones influence perceptions of art?

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Georgia O'Keeffe's "Black Iris III". Rudski showed pictures by O'Keeffe to women when they were in the fertile and non-fertile phases of their menstrual cycle. 31% of fertile women interpreted the pictures as sexual, but only 9% of non-fertile women saw the sexual double-meaning (for the record, O'Keeffe herself always denied her art had sexual connotations. She would say that, though, wouldn't she?).

The articles covered in the show:

Fraccaro, P. J., Jones, B. C., Vukovic, J., Smith, F. G., Watkins, C. D., Feinberg, D. R., et al. (2011). Experimental evidence that women speak in a higher voice pitch to men they find attractive. Journal of Evolutionary Psychology, 9(1), 57-67. Read summary

O'Connor, J. J. M., Re, D. E., & Feinberg, D. R. (2011). Voice pitch influences perceptions of sexual infidelity. Evolutionary Psychology, 9(1), 64-78. Read paper

Chang, L., Lu, H. J., Li, H., & Li, T. (in press). The face that launched a thousand ships: The mating-warring association in men. Personality and Social Psychology Bulletin. Read summary

Rudski, J. M., Bernstein, L. R., & Mitchell, J. E. (in press). Effects of menstrual cycle phase on ratings of implicitly erotic art. Archives of Sexual Behavior. Read summary

Being mean to keep ‘em keen: how sharing negative attitudes can bring you and your partner closer. We also find out whether beautiful people are friendlier, or meaner, than the rest of us, and why George Clooney is a total miser (possibly).

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There may be something to the popular belief that attractive people are mean, as new research by Price and colleagues shows.

The articles covered in the show:

Weaver, J. R., & Bosson, J. K. (in press). I feel like I know you: Shared negative attitudes of others promotes feelings of familiarity. Personality and Social Psychology Bulletin. Read summary

Price, M. E., Kang, J., Dunn, J., & Hopkins, S. (2011). Muscularity and attractiveness as predictors of human egalitarianism. Personality and Individual Differences, 50(5), 636-640. Read summary

Stirrat, M., Gumert, M., & Perrett, D. I. (2011). The effect of attractiveness on food sharing preferences in human mating markets. Evolutionary Psychology, 9(1), 79-91. Read paper

Skin colour special! What’s behind the current fashion for skin tanning, and why do some people go to greater lengths to obtain a bronzed body? I speak to Dr. Ian Stephen of Nottingham University about whether a tan really does look healthy and attractive.

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Example images from Stephen's paper that got the Guardian's commenters all flustered. The face in the middle shows the natural skin colour. The faces on the left show the effect of sun tanning, while the faces on the right shows the effect of eating more carotenoids. Participants thought the carotenoid colour looked healthier.

Hill, S. E., & Durante, K. M. (2011). Courtship, competition, and the pursuit of attractiveness: Mating goals facilitate health-related risk taking and strategic risk suppression in women. Personality and Social Psychology Bulletin, 37(3), 383-394. Read summary

Stephen, I. D., Coetzee, V., & Perrett, D. I. (in press). Carotenoid and melanin pigment coloration affect perceived human health. Evolution and Human Behavior. Read summary

How we tell the difference between two attractive faces, how hypochondria influences your partner preferences, and Meet the Parents: why mum and dad so often disapprove of who their children bring home to dinner.

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Why do our parents so often disapprove of our romantic choices? Perilloux et al. explain all in their recent paper.

The articles covered in the show:

Perilloux, C., Fleischman, D. S., & Buss, D. M. (2011). Meet the parents: Parent-offspring convergence and divergence in mate preferences. Personality and Individual Differences, 50(2), 253-258. Read summary

Bailey, D. H., Durante, K. M., & Geary, D. C. (in press). Men's perception of women's attractiveness is calibrated to relative mate value and dominance of the women's partner. Evolution and Human Behavior. Read summary

Little, A. C., DeBruine, L. M., & Jones, B. C. (in press). Exposure to visual cues of pathogen contagion changes preferences for masculinity and symmetry in opposite-sex faces. Proceedings of the Royal Society of London B. Read summary

How the length of a man’s fingers can tell you how likely he is to commit, whether taking the contraceptive pill makes you more jealous, and the relationship between your postal code and the size of your boyfriend’s biceps.

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The effects of the pill on a woman's biology are obvious, but what does a daily dose of the oral contraceptive do for her psychology? Cobey and colleagues decided to investigate.

The articles covered in the show:

Schwarz, S., Mustafić, M., Hassebrauck, M., & Jörg, J. (in press). Short- and long-term relationship orientation and 2D:4D finger-length ratio. Archives of Sexual Behavior. Read summary

Cobey, K. D., Pollet, T. V., Roberts, S. C., & Buunk, A. P. (2011). Hormonal birth control use and relationship jealousy: Evidence for estrogen dosage effects. Personality and Individual Differences, 50(2), 315-317. Read summary

Snyder, J. K., Fessler, D. M. T., Tiokhin, L., Frederick, D. A., Woo Lee, S., & Navarrete, C. D. (in press). Trade-offs in a dangerous world: women's fear of crime predicts preferences for aggressive and formidable mate. Evolution and Human Behavior. Read summary