The window. It's so much more fun looking down than staring at the ceiling during sex, says Michael Perry, Ph.D., a sex therapist in Encino, California. Have your partner lean against a window sill (make sure the window is closed) and enter her from behind. If she's wearing a short skirt or dress, and you keep your pants most of the way on, people below won't have to know what you're doing. But they probably will.