I'm going to throw you a curve ball, but not without reason. Deal with it. :p Nothing poppy or remotely familiar here. Play at a low volume, this is mostly moody stuff that has feel that can be taken as erotic at times, most of the songs have an inconsistent feel through their duration, lending usefully to some variation if you feel like matching you actions to the music a little bit, but subtle enough that it's not going to ruin the experience like a Chipmunks song tossed in to the middle may be apt to.

Porcupine Tree - Sky Moves Sideways - spacey, very long )over 30 minutes), has moments where the sound could be described as erotic. Some parts aren't ideal, but I think the music should be really low in this case - just loud enough that you can hear the music ok if you listen for it. See part 2, around 2 minutes in and going on and on from there. Here's the whole song, and, yes, these are all links to the same song in different parts, they don't fit in one youtube video:
http://www.youtube.com/watch?v=CxqlENEpWQM&feature=related
http://www.youtube.com/watch?v=QRuj-G8pJ8k&feature=related
http://www.youtube.com/watch?v=-IyDJ8hlYDo&feature=related
http://www.youtube.com/watch?v=ycugiVqY_-k&feature=related

Most other Porcupine Tree stuff doesn't come to mind with sex, but there are a couple other instrumental/almost instrumental songs in his catalog that may fit the bill depending on your tastes.

Ulver's Perdition City (album) is fantastic, in general. Make no assumptions for their other albums, this one is vaguely trip-hop, their other material ranges from metal to industrial. See:
Lost in Moments
http://www.youtube.com/watch?v=rzqxr7WFzuI&feature=related

Porn Piece or the Scars of Old Kisses
http://www.youtube.com/watch?v=0uocPJ33YBk&feature=related

Hallways of Always
http://www.youtube.com/watch?v=dHTivMMDk5U&feature=related

Most of the album would work as a background for sex.



For something more conventional, i can't help you. I'm not a conventional kind of guy. If you like something more exotic, there's a lot of interesting Indian music, Karsh Kale may or may not fit your question here depending on your tastes, but I like it. :D
Permalink | Report

William Tell's Overture. It's a winner!
Permalink | Report

I stick with a traditional Marvin Gaye

http://www.youtube.com/watch?v=18TLHhhHZCA

And sometimes a bit of Boys 2 Men I'll make love to you:

http://www.youtube.com/watch?v=PqU2WXKcUb0
Permalink | Report

I'd go with Love Bites from Def Leppard.
Permalink | Report

Barry Whites Secret Garden...that will get anyone in the mood!
Source(s):
lyrics.com

Permalink | Report

Assuming you are already in the mood, and want to move to the big climax, the answer is obvious: The 1812 Overture. Seriously, it works. I have a friend who claims she did it to Freebird, but I can't really see that working. I think she was stoned at the time.
Permalink | Report

"Over and Over" by Tim McGraw and Nelly!!

http://www.youtube.com/watch?v=temaoKXSVxw
Permalink | Report