Getting dirty while you get clean is a great idea for couples who are trying to mix it up or are short on time - or perhaps hot water. But before things get steamy, there are a few things you should know. First, preparation is key. Nothing can kill the mood faster than a stinky, dirty or cluttered bathroom. So wipe up all that soap scum, scrub the toilet and clear off the counters before even thinking about water sports. Next, consider the traction in your shower. Nothing can kill the mood faster than someone slipping and cracking their noggin on the side of the tub. Put down a mat with lots of traction, or at the very least, lay a large towel in the bottom of the shower to cushion and support you. Don't rely on fixtures to hold on to - soap dishes, towel racks and the like can't support the weight of an adult, particularly if it's an older fixture or you're pretty rough. Now that things are clean and safe, it's time to get busy.
A few guidelines to follow when there are two of you in a shower built to accommodate just one adult...first, consider getting foreplay done in front of the mirror while the shower warms up. Watching the two of you making out and touching each other can be a major turn-on. Then start by cleaning each other up. Lather each other, using a loofah, bath puff or just a washcloth. Be sure not to get soap in delicate places and to rinse well - when penetration happens, it can be uncomfortable for women to have soap residue in that area. Position-wise, there are quite a few options, depending on your flexibility and the size of the shower. If there's room, missionary or woman-on-top are definitely options as the water rains down on you both. The man entering from behind is optimal for the shower, and the woman can brace herself on the side of the tub or against the wall. Go easy when it's time to change positions - shower sex isn't marathon sex; it's just meant to be quick and fun.