Here is an excerpt from a related article
"If women don't have many opportunities to make money on their own, they need the value of sex to be as high as possible. When women don't have other opportunities, sex is the main thing she has to offer. Women will hold out longer for sex if they can't get power in other ways. In countries where women are at a big disadvantage, they restrain sex, so the price is high and men make a lifetime commitment to support them to get sex. Men will do whatever is required for sex."
This may be true, especially insofar as women with few economic opportunities need to secure support from men. But there are several other explanations for the findings. And countries with poor gender equality also often have strong prohibitions against women having premarital sex — in fact, constraints on women's sexual behavior are one of the hallmarks of inequality. So women in such countries might well under-report their number of partners, driving the total number of "partners per capita" down. Also, women (and men) in these countries may have less casual sex because it's socially stigmatized, not because women are "restraining sex."
P.S. This whole hypocritical psyche is based on some deep rooted contradictory flaws in our own thinking, culture and society. And it is not gonna change unless we root out these basic unislamic and inhumane paradoxes.