Not romantic, and not necessarily explicit, but sexy.
Being an old codger kinda guy who more or less stopped following pop music in the late 80s, here are mine in no particular order.
Angel of the Morning by Merilee Rush. I think this was the first song where I understand a woman wanted sex from a man, and my adolescent self has never forgotten.
The First Time Ever I Saw Your Face by Roberta Flack. For some reason I still think the line “kissed your mouth” is 10 times more erotic than “kissed your lips”. And don’t get me started on the sun and stars references.
Light as the Breeze by Billy Joel-- very odd and allegorical, perhaps a tale of obsession, perhaps the woman is some kind of succubus? Whoever or whatever she is, I want her bad.
I’m So Excited by The Pointer Sisters. What can I say, I love their enthusiasm. Also a great uptempo pop tune aside from the sexual connotations.
I’m sure you can suggest more,