Well, the short answer is, that sexual activity and sexual stimulation are extremely gratifying. And that men have these desires for such activity whether they have a wife or girlfriend or not. Many men can engage in such activity without cares for a relationship component, whereas most women wouldn’t get involved in such acts without being in a relationship situation with a man.
LOL.
You were doing fine until you typed that.
Yeah, women never have one-night-stands, affairs, sex-on-the-first-date, etc. Only men.
This may come as a shock to you, but....