Lakes and oceans are teaming with bacteria, Dr. Gupta said. So are pools and hot tubs. "The chemicals used to keep pools and hot tubs clean are harsh and bad for your vaginal health," she noted. "They disrupt your pH levels and can lead to infection and irritation." Be especially wary of sex in hot tubs, because it can increase your risk of hot tub folliculitis. This, she said, is an infection that affects the hair follicles because of the overgrowth of bacteria in warm water.
"Anything just involving hands is OK for these environments, but I advise against penetration," she continued. Having sex in any body of water, shower included, can sometimes cause painful, unwanted friction due to added chemicals and salts (water can also wash away natural lubricant), she added. Sex under a clean shower is perfectly fine, though, she said.
Dr. Gupta wanted to share this reminder as well: if you do choose to have sex in water, don't forget to use condoms, because you're still at risk for pregnancy and STIs.