Anti-focus: You know what song makes a man's wang go limp? Anything from the Sister Act soundtrack. Focus: I like banging to classical music. Particularly something with a solid thrusting beat, three tubas and cannon fire.
Most recently I've fucked to Peggy Lee Radio on Pandora, and that will set the mood for all sorts of fucked up shit (anyone who has played Bioshock will know the truth to this).
An ex of mine told me, years later, that she used to get wet every time she heard this because we listened to it basically every time we fucked.
Focus: Never bothered with music, because it's the moaning, groaning, and filthy dirty talk accompanying passionate sex that gets me off best. I don't like other distractions while I'm gettin' busy.
Bitter:Sweet is one of my favorites for sexy time. Some slow. Some fast. Deep bass, sexy vocals. Always a hit. Whenever I think about putting this on, this is what goes through my head.