lady-killer
lady-killer {n.}, {informal}
1. Any man who has strong sex appeal toward women.
Joe is a regular lady-killer.
2. A man who relentlessly pursues amorous conquests, is successful at it, and then abandons his heartbroken victims.
The legendary Don Juan of Spain is the most famous lady-killer of recorded history.
Compare: LADY'S MAN.
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Source: A Dictionary of American Idioms