Okay, I'm looking for the name of a song--it was I believe one of the top 100 hits of 1973.?

All I remember is that it was a sensual ethereal soul groove--and a few fragments of lyrics (either sung by a woman or in falsetto): "Nice and easy--ooh, how you please me...when I'm getting down, down with you...do it baby, do it do it baby, do it do it baby, do it do it yeahhhh..." (Just be glad you don't have to hear me sing it.)