I know, it sounds absurd, but hear me out. Most women aren't actually asexual, theoretically they are sexual, and feel aroused sometimes.

But the problem is that because women require such a high level of stimulus to achieve arousal and because they find the overwhelming majority of men repulsive, it must mean that women are PRACTICALLY asexual. Some people say that men are actually physically repulsive on average, but if that were true then gay men would also find most men repulsive, but that's not the case. Gay men are known to be very promiscuous and frequently have sex with large numbers of men.

Another factor that comes to mind is that most women rapidly lose their sex drive after marriage or long term settlement with a man. This to me suggest that the only purpose of the female sex drive is to find a suitable mate to reproduce with; once the mate is settled, then there is no need of a sex drive.