Men often feel this way because of society's emphathis on large penis'. Pornography shows men with larger than average penis' and men who see this feel that their penis should be the same length.

i feel so cool. i think about it all day

Gay men and women don't "feel the need to be gay". We are gay. That's the way we are. You don't ask "Why do straight people feel the need to be straight?"

Most do. Gay men feel the same way about other guys as straight men feel about women. Generally there is an emotional attraction as well as a purely sexual one.

Men usually feel a lot of pain if their testis is hit because of the very sensitive sensory organs.