Hold On
The last time I had sex in the shower, I was bent over almost double while my partner held my hips and found a good rhythm. He (and his cock) felt great. Even the water was nice. What wasn’t nice was the way my head nearly hit the shower wall with each thrust. The fix? I held onto the towel/shower bar in the tub (where washcloths usually hang). This also gave me leverage to push back against him. If you want to go one better, install a sturdy grab bar just for this purpose.
Go Slow
If what you want is wild, thrashing sex that shifts to a new position every few minutes, the shower or bath probably isn’t the place for you. You can enjoy a fast fuck in the water, but any movement from one sexual position to another will need to be slow and deliberate to avoid any slips or falls. Busting your ass in the tub isn’t sexy or fun.
Bring Your Toys
Toys in the bathtub are fun as long as they’re the right toys. Look for a fully waterproof toy, ideally one that's easy to hang on to (toys get slippery too). Read reviews before you buy a toy if you think you’ll use it in water. Plenty of toys claim they’re waterproof but some don’t hold up in the real world. (Get more tips in Water Masturbation - Have You Tried This Yet?)
The O-Wand is fully waterproof and includes an easy-to-grip handle, making it a great choice for the shower or bath.
Keep Your Face Out of the Water
Oral sex in the shower can be sexy and erotic - until you’re hit square in the face with water. It looks sexy in images but the reality can be very different. The stream of water going up your nose while you’ve got someone’s genitals in your mouth makes it difficult to breathe. (Ask me how I know.) Be mindful of your position and either move the shower head or make sure you’re in a good spot so you can stay comfortable (and avoid half-drowning!) while you pleasure your partner.
