I think it mostly depends on the mood one is looking for.

For example, is it "making love" with that really special someone? Then, definitely, put on "What's Going On" by Marvin Gaye, or, "Let's Stay Together" by Al Green...those are great lovemaking discs.

However, if it's just pure, animalistic sex (which, hopefully, can also be with that special someone), then you need to put on "Exile on Main Street" by the Rolling Stones. It's great shagging music.

Just one man's opinion.