This may be off topic but another cool thing to do which I've insisted a few of my gf's to do is when having a bath, as the water is flowing... is for her lay on her back, slide her ass all the way to the end of the bath tub where the water's dripping and rest her legs vertically on the wall while the fountain of water hits her directly on the pussy/clitoris. Apparenlty this feels quite good and results in some good orgasms. Hot tub jets work well also...