In thinking about it, I find that I don't have any particular feelings for sex scenes. I'm guided much more by the overall writing.
If I'm liking the writer's voice, I'm perfectly happy with sex scenes. When I read, I'm trusting the writer to take me through a story. If they feel they need to take me into the character's sex life, fine, I'll give them some rope (no BDSM pun intended).
If I'm not liking the writer, I've stopped reading long before I hit a sex scene. Bad writing is a turn-off regardless of whether it's about sex.