Smörgåsbord, Squared: Opening Perek Sheini by Intertwining Two Central Themes of Masseches Kesubos - Sep 3, 2025 - Perek sheini opens at the intersection of the primary and tertiary themes of Masseches Kesubos. Primary theme of Kesubos is the financial aspects of the marriage relationship (during marriage [perakim 4-8]; kesuba [1-2, 9-13]), secondary theme is zenus (under duress [2-4]; premarital[1]), tertiary theme is toras ha-sefeikos [1-2].