I say go for it! Is this a reciprocal thing for the two of you? Its interesting how the difference in gender makes it a totally different experience. With a woman, it seems like an extention of cunnilingus...due to proximity of course
. (The keeping anything that has been in the backside away from the vagina axiom is easier to remember than the "Liquor before beer in the clear" one). When I've been on the receiving end, its the giving up all power and control aspect that turned me on the most. Its got to be something that she gets hot doing, otherwise it doesn't do that much for me. Either way, the cleanliness issue just gives the two of you the chance to have some foreplay in the shower! Not bad at all.