What makes him so sexy?

idk its either his pale white skin or pubic hair mop on his head

"Power is the ultimate aphrodisiac"~Henry Kissinger

His money (and keep in mind, it's only what girls stupid enough to date or marry him find attractive).

I can't opine since I'm a straight male, but have you noticed his Assburger's Syndrome walking style? It's very similar to Matthew Brokedick's way of walking in "War Games" and "Max Dugan Returns". Matthew sorta abandoned this walking style after Ferris Buehler but almost returned to it in "Erection" (1999)