There is a chemical in a girls’ brain that is released at only two different times in her life, when she has sex, and when she breast feeds her baby. This chemical emotionally connects her to another person for the rest of her life. Us guys? We only release this chemical when we bond with our children. So if you think sex is a game and go around fucking as many girls as you want, remember that you will mentally mess this girl for the rest of her life. If you’re still friends afterwards then whatever, but she will always have the same feeling toward you because of this chemical. Just a little bit of science.