something like the friends above me have said, i like music in geral, it puts you in the mood "i'm playing a game" not "i'm reading a +18 comic" but for the sex scenes it's more complex, if it's a romance sex scene a low background romantic music can give it a boost, but if it's a wild public sex scene it can be a little off mood, so i suggest to break the silence is to make good use of sound fx, public sex in a back alley? a backgroun traffic loop, voices, steps, etc. Intimate moment in a bedroom? a bed creaking sometimes, soft moans, bed sheets sounds, etc
What i'm trying to get at is, the mood wins above anything else when it comes to sex scenes.