Jedi masters are an organization whose ambition is to control the general population by means of manipulation and violence in a fantasy universe, called Star Wars. This probably explains the popularity among nerds and geeks. They would sell their soul to be able to manipulate normal people into doing their bidding. Alas, they are mostly still virgins.
The most likely cause for there virginity is most likely because they don't like having sex.
Jedi and the Census
Rumour has it that if enough people write down Jedi as their self-declared religion on the Census form, then the government will be forced to include it in official census statistics. So far, there is no evidence that this is true, but thousands of Australians tried it in the last national census anyway, just to see.