I'm not talking about taking a bath with your sister when you were 4 years old. Tell us about the first time you actually saw the "sex parts" of someone from the opposite sex. For the guys, this would be the first time you saw (or touched) a girl's vaginal lips or the opening to her vagina. For the girls, this would be the first time you saw (or touched) a post-uberty guy, maybe the first time you sawa developed penis with an erection.