There is a fairly famous sex study that showed sexy pictures to men and women (men or women exercising, couples of various orientations having sex, and lastly a monkeys having sex). They then had the subjects report what turned them on (and how much), which was compared to what instrumentation reported they were actually aroused by.
Men's reports of arousal were consistent with the instrumentation and their reported sexual orientation but were most turned on by woman-woman action (i.e. the women of your harem are in heat, time to do your job). Women reported arousal consistent with their reported sexual orientation but the instrumentation showed they were actually aroused by sex of any and all kinds, even monkeys. The men did not find monkey sex appealing.
That
particular study is
talked about here and
others have corroborated the findings. That's the science, now the speculation...
So if a woman is damaged and no longer interested in men the attraction to women remains and may even grow stronger via feedback conditioning. Anecdotal reports in both men and women are that sexual fetishes are highly malleable. It's also been widely noticed that women are much more sexually active/enticing around ovulation. Nor are we the only species which engages in female-female sexual activity when one of the two is in heat. As to the humorous little bit about the monkey sex, ignoring the obvious evolutionary explanation, I'll point out that sex hormones are bio-identical among all species. Ducks have been known to try to breed chickens. And both male and female cows have been reported to attempt to mount human women who are ovulating.
Another thing to think about is the biological imperative. A man who fails with one women will not pass on his genes by turning to men; but he may try a different mating strategy with the next woman. But a woman who failed the first time, by hitching herself to another women makes herself a more appealing target for the next male to happen by (volume & variety). Engaging in sex only ups the attraction (that heightened arousal to female female action). Female fertility is fleeting, time is of the essence. None of this is at the conscious level, but the subconscious or hormonal level.
There is also the
Coolidge Effect, wherein a new female showing up causes an increase of arousal and sperm production in the male. This lends to speculation that by forming a harem, the female participants are more likely to conceive if there is multiple females and they all participate. They'd also be more able to hold his sexual interest (meaning he's less likely to wonder in search of more who would further split his resources; i.e. 1/3 of a man is better than 1/10). There is also documentation of increased sexual interest by females in new males who show up. Given the non-specificity of female arousal, I suspect this equally applies to a female showing up; further accentuating the above factors.
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(There can only be 1 God.)
