I write for enjoyment, and to stop the voices ;) Some of these characters just want to get out, and writing is the only way to help them.
I won't typically use watersports, and I certainly won't have scat in my stories. I will write about strong females, dominance and submission, and I will certainly meddle in the darker side of sexuality. I may occasionally indulge in something akin to a stroke story, but my typical stories will have a plot (or two), and developed characters. This means that they usually won't be all that short, so you may be in for a bit of a haul when you start reading ;)