I am baptist and I can say that I have never heard a baptist preacher say that it is a sin. I masturbate all the time. I think it is a good way for younger people to save themselves for marriage(I wish I would have.) I have not heard the story that everyone keeps referring to but I don't think it is referring to masturbation. I think it may be saying he pulled out because the bible does say be fruitful and mutlpliy.