Sex is not only reproduction if it was it would be like dogs one time you're impregnated by a bunch of different males and that's it. We are a socially cooperative species end in relationships it is not only sex once in awhile for reproduction it is sex as a social binding between couples to stay together long enough to raise their offspring to where they cancel survive. If you don't understand this do some research and look into evolutionary biology mating practices etc. The greatest level of education I received what's the fifth grade, however moving around all the time I had incredibly interest in knowledge. To this date I'm only 78 years old I'm still studying and I'm still enjoying learning new things. So if I can learn this other people should be able to do it as well. Scientia Non Domus Habet l. (Knowledge Has No Home) antiguajohn