For the source text click/tap here: Kiddushin 9
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The rabbis in our are concerned about betrothal through sexual intercourse alone. What about the transfer of documentation or of money? The rabbis discuss the intricacies of such a scenario. If a man has intercourse with a woman who is betrothed, he is liable to be stoned (Deuteronomy 22:23-24). But if he betroths her with money and not intercourse, is she fully betrothed? What if he betroths her with money and then engages in anal intercourse with her? Does anal intercourse affect her status as a virgin – and might it affect her status as betrothed?
Our view of bi'a maintained that bi'a, as well as kesef and shtar, is a ma'aseh kiddushin effecting the acquisition in an abstract manner through a symbolic act.
Might bi'a be something different? Might it not merely signal the start of a relationship but actually forge that VERY relationship?