Vote #1 Audrey Ackerman: Audrey Ackerman’s answer to What is the closest masculine equivalent of “temptress” and “seductress”?
A comprehensive answer I will not hope to top.
Audrey has missed one term. She would reject it as a culture specific, literary reference.
But hands up; who knew that Lothario was a character in Don Quixote?
A lot less than know what a lothario is. I’ll concede, not a massively common term; but maybe a touch better than Casanova (which has the whiff of pathology about it for me), certainly more apt than Romeo (I get that from my wife too, but it is pretty jocular, and Romeo was not meant to be irresistible); and Alberto Yagos is right, Adonis is about beauty and not seduction.
Pretty sure stud and hunk have gotten to the literary register by now, surely.