I wholeheartedly agree, that men do this, and in my mind it’s immoral. It’s so important to be clear about the terms of engagement. Of course there are outliers, but my experience has been that in return for sex, women tend to want money, monogamy or both. Unless you’re an Adonis like God, good luck on finding women that are exclusively interested in trading sex for sex. It surely may start that way, but it’s not sustainable.