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a man can take a real interest in any normal woman who is genuine sexually intersted in him (not "just sex" that is another way of stigmatizing the male pov while denying that there is a legitimate one which differs from the female pov), unless there is someone MORE appealing for whatever reason who is also taking an interest (this is the problem, one of them anyway, men find TOO MANY women appealing). Women require more. Men used to be able to make up this difference by making use of the social/economic/cultural privilidges they have to enhance their, at least apparent, appeal. Now it's down to looks and sexual charisma alone and the fact is women require a higher dose to get a result than men do. A perfect example is fat people, a woman who has 50% or more body fat can still have a sex life (her choices may be somewhat constrained but she can still have one), an equivalent man, unless he posses unusual qualities, cannot. Maybe the level of interest women took in average men in the past was "unnaturally high", who knows.