I like necrophilia for the same reason I like time stopping fantasies, having full control of a body that once belonged to a girl and being alone while doing so (I'm shy).
I occasionally check sad panda's necrophilia tag for new works. There are sadly only like 1500 galleries anyways. We have necrophilia threads on /g/ too. Sometimes there are obscure Chinese artists whose work is hard to find
I fap to all corpses from fresh ones to maggot ridden ones, but I don't know if I would be able to have sex with a rotting corpse IRL given chance.