I just realized this. Its so easy to have sex with someone te don't have feelings for.I mean come on, Cuddy hasn't had sex in what, 5 years? The girl has needs. With Lucas she can have uncomplicated sex therefore fulfilling her physical needs without getting her feelings hurt. With House there is no waaay that's gonna happen.
She'd probably spend the morning worrying what going to happen successivo and how its gonna affect their relationship.

Give Cuddy some credit. And don't forget that House slept with two women on this show. I mean we obviusly forgave House for his tryst with Stacy and Lydia, why can't we do the same for Cuddy?