Like, typed out sound effects in the dialogue box? Not really, no. Just depict the scene, unless they're actually speaking I can mentally fill in the sounds they're making. But then I tend to feel the same way about most actual sound effects in sex scenes, so...
I'm gonna say yes. I mean it's not terribly important, and it's usually done badly, but it's not an easy thing to do well and I kinda enjoy seeing how the writers choose to tackle it.
No.
I dont play with sounds and i dont need to read descriptions of sounds. People who dont know how sex sounds should get some instead of playing around.
Having never really thought about it before I now insist that all adult games have giant textual sound effects flashing up on the screen like the 1960s Batman TV show.