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A part of the article: Well, according to new research published in the journal Archives of Sexual Behavior, it may have evolved in order to promote social bonding amongst humans. This is the first study of its kind to find discrete evidence that our need to bond with others, actually increases our openness to engaging in homosexual behavior. For their study, a team of researchers from the University of Portsmouth looked at the relationship between sexual attitudes and the hormone progesterone. What they discovered, is that the more progesterone there is in a heterosexual woman’s saliva, the more open she is to the idea of engaging in homosexual behaviour. Likewise, heterosexual men who are subtly reminded about the importance of having male comrades, reported feeling more open towards engaging in homosexual behaviour - and that was particularly true for men with higher levels of progesterone.