Re: \"The Game\" Book discussion
Pair bonding is also why humans are one of the few species that has sex when the woman is not ovulating. The promise of sex on a regular basis keeps the guy around long enough to bond with the woman. If women went in "heat" like other mammals and were not at all interested in sex outside of that time frame, then there would likely be very few monogamous human couples. Guys would just chase around after whichever female was in heat.
Interesting side note: There was a study once that showed women who were cheating on their husbands were more likely to do so when ovulating. Their brains may not have known what why, but something deep inside triggered an increase in sexual desire right when it would matter most. So humans likely had estrus at one point, but evolved away from it.
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