My question is, is I necessary to wear underwear under your pants, if so why? :confused:

I have heard that many women don't
Zsa Zsa Gabor said she didn't as well as some other famous women.
Through the years I have known a few guys that said they do not. I told them that is a need to know basis and I didn't need to know!

I think it would be for the cleanliness of the underpants 'protecting' your pants I guess.
Plus some pants you can see right through.