A joke I heard.

A Rabbi and a priest were sitting together on a plane when the priest suddenly asked the Rabbi if it was still true that in the Jewish faith one can't eat ham. The Rabbi confirmed that it was. The priest asked the Rabbi if he had ever given in to temptation. The Rabbi confirmed that one time he ate a ham sandwich and it had tasted good. The Rabbi asked the priest if it was still true that priests had to abstain from sex. The priest confirmed that it is true. The Rabbi asked the priest, have you ever given in to temptation, and the priest answered that yes, one time he had had sex. The Rabbi was quiet for a few moments and then said, it sure beats the heck out of a ham sandwich, doesn't it.