Many people believe that by having sex in a pool or a hot tub, they are at less of a risk of becoming pregnant because the chlorine or heat will kill the sperm, but that is not true. “The only thing the chlorine will kill is the vaginal pH!” ER physician Dr. Travis Stork says. “So, not only are you going to be irritated, you can still get pregnant [and] still get STDs. You can hang out in a pool or hot tub all you want,” Dr. Travis adds. “But if you're having sex, it doesn't make it safe sex."
OB-GYN Dr. Lisa Masterson cautions that when having sexual intercourse in any sort of water -- be it a Jacuzzi, waterfall, pool, etc. -- people must still protect themselves against sexually transmitted diseases and unwanted pregnancy.
"Condoms are less effective in water," she says. "Oils and suntan lotions can also break down the condom, so you have to be really careful."
Polyurethane condoms are stronger than latex condoms, and their chemical composition will not break down as easily. If you use lubrication, be sure to use one that is silicone-based, and apply it before getting into the water.