Remember when Howard was supposed to be tutoring this teenager. Instead he meets her sister, who worked at a dance studio or something like that, and began falling for her. As smart as Howard was, don't you think he would know better. He let a teenager out slick him, just like Andy said.

Hey, he's human and a guy. What guy wouldn't want to spend a little time with a cute friendly chick. Howard's a trusting soul who didn't think the boy would con him to get out of the school work and he hasn't had a whole lot of experience with women so he was flattered.