And since reported HIV cases among Singapore citizens continue to rise it has more than doubled from in to in , this is a must-know: In other words, consider it a warm-up: The worst part about lake or ocean or beach sex is the sand factor. Instead, consider starting things off in the water, but then heading to dry land for the main course. Less lubrication means more friction, and that means stress on your condom and her urethra, which can lead to infection. If your tub is small, you could have trouble in the missionary position. Have your girl sit on the deck of the pool or on the stairs while you stand in the water, or vice versa. Lou Paget, author of The Great Lover Playbook, recommends doing everything in the shower except intercourse, to avoid any nasty spills. Somehow, even if you are extra careful, sand ends up lodged… places. Perhaps a nude soak in the hot tub, a soapy scrub-down in the shower, or a late-night skinny-dip in a lake. Having sex underwater — or "submerged" sex — is simply not a good idea, especially for women. Here are some ways to get wet and wild without going below the surface. Staying Sexy But Safe While having sex in water is slippery fun, you still have to practice safe sex — and, unfortunately, if you plan on using a condom, you should know that water and condoms do not mix.