Only a few contestants gave answers that were bleeped, and it happened with FAR less frequency than with the celebs.
I can't imagine anyone would just "give up" and give an answer none of the celebs would possibly say. In the second round, points were doubled, and the questions were far easier to get a match from all 5 stars, especially towards the end of the run.
My guess is, the contestant thought the stars would go very "blue" for this question, so he gave that sort of answer. Was there a previous question where celeb's answers were censored? That might've influenced him too.