I generally turn the music off because with a small exception (like in Melody) it becomes repetitive and annoying. What for sexy sounds (and other exclamations), I recently played through the Fetish Locator and all those exclamations like Yeah! and Nope! just drove me mad. The voice is usually not a professional actor and sometimes it sound weird.
So, speaking of myself, in the AVNs I care for the sound the least. In some AVNs, like Desert Stalker, the sound and music are just great. But those, I repeat, an exception.