Not sex exactly but ... years ago, I dated a woman about 10 years my junior, and whenever she would come over, she would have an entirely separate bag of shower supplies (loofah, body wash, shampoo, conditioner, on and on). So delightfully aggravating. She was somewhat petite, and I have this wonderful memory of her rinsing the $45 shampoo out of her hair, facing me with her back to the shower head. I just couldn't get over how beautiful she was, with the water and suds running all over her. She opened her eyes and noticed me staring at her, put on this nervous little smile and said ... "What?"
Another woman was very, very shy about being naked in front of me, never let me shower with her, always turned out the lights before taking her underwear off, that sort of thing. Which I thought was silly because I thought she was beautiful. One night (all the lights in her place were off) she got this wild hair, came into the room giggling, and grabbed me by the arm, and led me to the bathroom, where the shower was already running, and she had one little votive candle lit. We stripped and got into the shower and laughed our asses off, because we had to fumble around in almost pitch darkness to find the shampoo, and I accidently hit the cold water (she liked showers blazing hot).