As for women: You do know that dick alone isn't gonna do it for most women, right? Only a small percentage of women can come from PIV intercourse alone. (If you didn't know, you know now, and you're welcome.) And you're familiar with the clitoris, right? (If you weren't, google it, and you're welcome.) But if you find yourself in bed with a woman and you're having difficultly helping her come (you're there to help not make), ask her if she can make herself come. If she can't, odds are you won't be able to help her come, either—not you, not anyone else. If she can make herself come, ask her to masturbate to climax while you watch. Make a close study of what works for her. If she touches herself in a certain way, learn to touch her in that way. If she busts out a vibrator, use that vibrator before, during, and after PIV or instead of PIV. Good luck.