Yeah he definitely didn't get laid in high school. Years of repressed adolescent lust does lots of damage.
Sure his wife may be gorgeous, but maybe she doesn't fuck him. At that point, he's in the clear and has a green light to fuck whomever he chooses. Also, being rich and famous...why WOULDN'T you prefer whores to the regular girl you meet in a bar or something? Whores usually keep their mouths shut, don't try and stalk you, and don't get greedy. He's a married man, so he's not looking for a soulmate...he just wants to get laid.
Discretion can be a huge factor.