First of all, how old are you or the people that are thinking that way? If your answer falls between 13 and 24...then that explains it
j/k. People of all ages have diry minds, but I know what you mean. When I was in high school people around me tried to pull something sexual out of anything said. I think a lot of it has to do with sex being pushed onto society so heavily by the media...movies, music, tv, magazines, etc. I know I am probably sounding like a gramma (I am 27) by saying that, but I can't think of why else everyone would have it on their minds in some way as long as its everywhere you look.