Choke by Chuck Palahniuk
That brief summary sort of says it all. If you liked Fight Club, chances are you will like this. Grit, sex, absurdity, amusement (a couple laugh out louds) and moments of perspective.
An easy and enjoyable read.
A couple memorable lines:
"Sometimes I think I'm doing a bad impersonation of myself."
and another delightful reference to patting your head and rubbing your stomach.