Hi George, I am sure that you will get lots of suggestions, but for me nothing surpasses the sensuous celebration of physical love (brushing aside all moral considerations) in Monteverdi's The coronation of Poppea. Strauss has depicted intercourse in instrumental music two times (that I know of), in the Rosenkavalier overture and in the Arabella prelude to the third act. As for the madrigals, what you say is true, but it becomes even more striking if you broaden your definition somewhat to include other kinds of Renaissance vocal polyphony, like the Villanelle or Moresche, which seem to deal almost exclusively in matters sexual (and coprophilic, which I like rather less). For my money, nothing can beat the Concerto Italiano's disk of Orlando di Lasso's rowdy wordly works and songs on Opus 111. That is a pure delight and definitely worth checking out (I think this CD was orginally marketed with a sticker that read "All you ever wanted to know about sex" or similar). And finally, I suggest you check out the fellatio scene in Thomas Ades' recent opera 'Powder her face'. Best, Andreas