SEX v. MASTURBATION

Researchers at the University of Paisley, Scotland, reported that, "...prolactin increases following orgasm are involved in a feedback loop that serves to decrease arousal." And that "the magnitude of post-orgasmic prolactin increase is thus a neurohormonal index of sexual satiety. Finally concluding that, "the magnitude of prolactin increase following intercourse is 400% greater than that following masturbation."

In a other words, you need to masturbate four times to get the same benefits of one actual fuck. But you kinda already figured that out yourself, didn't you?