There are many things to love about having sex. I won't mention the obvious because it's, well, obvious. But I will mention the inflated sense of self-esteem. Having sex makes me feel attractive and desireable. Not just during sex, either, but sometimes for several days or even a week afterwards. On one occasion, I went to work "glowing" and was asked if I'd gotten laid last night. Apparently I glowed for two days.