Big, small, spiral, detachable, great for nibbling on … when it comes to the male member, nature has been extra creative. From genital-chomping banana slugs to the guided sperm missiles of the nautilus, this episode is all about the power of the penis!

Get ready … we're about to pop the cherry on a hot topic: virginity! Find out why males prefer to explore uncharted territory and why females desire a mate who's been around the block.

So you're not an alpha male – big deal! Forget your physical shortcomings and learn a few underhand manoeuvres to score points in the mating game. From crafty cuttlefish to ingenious iguanas – the animal kingdom is full of sneaky f*ckers.

Who said gender benders are for humans only? From male snakes that harness the power of oestrogen to girls that moonlight as boys, cross dressers from all corners of the animal kingdom use deceit to gain that reproductive advantage.

Wanna hook up? Then you'd better bust some moves. Females like a mate who can move like Jagger. Whether you strut it like the elegant flamingo or you shake it like the peacock spider, only the best moves get the girl.

It's time to rise to the occasion and tackle that eternal question: does size matter? To get to the truth, we'll need penises aplenty … from the gorilla's modest member and the tapir's physical feats to the ultimate Dirk Diggler of the animal kingdom…the barnacle.

Like it or not, looks matter. For human and non-human animals alike, what's on the outside dictates who gets lucky and who strikes out. So get ready to delve into the science of what's sexy – from the flashiest feathers to the bustiest babe.

What do sex toys have to do with animal mating rituals? They might not use gadgets to maximise pleasure like humans do, but animals certainly have ways to make sex more fun.

You're about to enter the dangerous world of sexual cannibalism. And who's the poster animal for post-coital mate eating? The praying mantis, of course!

From sexual organs that impale to ones that can lock you in for life…the world of animal sex can be a sticky affair.