For most of the movie, Megan was a lazy loser and a witch. As a result, who would care if she actually connects with someone. In fact, for any guy's sake, you would hope she doesn't. Alec sure deserved more given the explanation for what he did.
The toilet humor early on was a complete turn off and that stuff leaves a smell which wouldn't go away easily, so how romantic!
One stupid situation led to another and they were not funny, but again there were some more or less funny ones in between.