anything depeche mode......seriously check them out, all their songs are about sex!
oh and "hands down" by dashboard confessional talks about sweet lovin.
hmmm tryin to think of more...
"you shook me all nite long" by AC/DC
"i want your sex" by George Michael
some of the cure's stuff is sexy like "lovesong" or "just like heaven"
or foreigner's "hot blooded" "urgent"
inxs "need you tonite"
thats all i can think of for now.