If as you say women (and why not?) get genuine satisfaction by themselves and for men it is mainly relief, then clearly human beings evolved to be solitary and by regular intercourse closeness cannot be achieved, except as friends?
Thanks Stanley for commenting. Intercourse is a key emotional bonding mechanism for men. The offer of regular intercourse keeps men tied into relationships with women and willing to support family life. But achieving orgasm is a selfish pleasure however it is achieved. We need to focus on our own arousal. Intercourse is effectively male masturbation with a lover. A key difference between male and female responsiveness is that a woman only achieves orgasm alone when she can focus on her own arousal. A man is dependent on a lover, for penetrative sex, to obtain the best sexual release. This is, of course, for biological reasons and for the survival of the species.