I not only have skylights in my bathroom, I have one in the shower. Granted, it's a large shower (4x6 feet) and the skylight sits over a thrust out, sort of like a shelf, so the skylight itself is about 5 feet away horizontally and 5 feet higher than the shower fixtures. It was installed in 1996 and I've had no problem. I do suggest that if it is wood trim that you use a marine based varnish or stain. The wood does get a little faded and worn after about 6-7 years, probably from a combination of condensation and UV, so I sand it down and restain it. I am careful about running the exhaust fan.