Proof that Jesus never married

There have been a few books and movies over the years, The Last Temptation of Christ and The Da Vinci Code for instance, that use the plot device (or perhaps they think it really happened) that Jesus was married.

I can tell you for sure that this is impossible. Jesus was without sin when he died on the cross as payment for our sins. That means Jesus never told a lie. If he had been married, how could he have answered the question, "Does this make me look fat?"