Is sexual desire stronger in men than women?
Some of the work of Bob Trivers makes some sense to me. He talks about parental investment https://en.wikipedia.org/wiki/Parental_investment.
The "investment" of a man could be as little as paying for dinner, followed by a few minutes of sexual pleasure, and then he is free to go. The woman's investment for the same thing is the risk of pregnancy (or cryptic STD). Pregnancy is difficult, and before modern medicine, was one of the most common ways to die for women. Then she must feed a helpless infant with her own body, and tend to its needs for the next 15 years. We have social structures for the man to stick around and contribute. But these are not biological differences. The man can leave. The woman cannot. She bears virtually all the risks of sexual behavior. Of course, sexual desires vary by individuals, likely in a bell-curve that overlaps (I anticipate some PC doofus pointing out that some women have strong desires, and some men don't). But I would not be surprised at all, given the biological differences in risks and investments between men and women, that the peak of these overlapping distributions is higher for men than women. Also, evolutionary fitness is defined by the number of offspring an individual can produce. A man's strategy is fundamentally different than a woman's. A man who has 1000 sexual partners is likely to leave more surviving offspring than a man who marries the woman he loves, and stays faithful. A woman with 1000 sexual partners would not be able to have hundreds of children, and would likely put her health at risk.