Why is SEX Fun?

What's wrong with sandals with socks? It is very comfy!
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I was reading Jared Diamond's "Why is SEX fun", guess he was doing research on more interesting topics before the prize winning book of "gun, steel and roses", also the "collapse". A couple of very interesting points he has raised in this research (that I remembered). Collapse itself is an very interesting book, Jared has so many facts to state, yet he refused to impose his conclusion on the readers. In a way, it is not as satisfying for an impatient person like me. Why can you not give me a theory, an hypothesis, I can tell you straight away whether I like it or not.

The book is trying to answer the question why Human Beings can make love all year round (also, around the clock), where other mammals only do it once or twice a year. In other words, why is it fun to do? He is trying to explain this from evolution's point of view. Because human females don't make the ovulating detectable, human male would have no idea when is the best time to have sexaul intercourse with the female in order to increase the chance of hitting a jackpot. Thus, those who think sex is fun spread their genes more efficiently. "Sex is fun" is coded in our gene!

The other interesting point is why human females having manopause if our biggest drive to live is to spread our genes. Some would argued that humans nowaday live longer to reach manopause. However, there are animals that can be productive if extending their life span in the controlled environment. The theory is that the most capable gathers were actually those women who live passed the manopause. They bared no responsibility in raising kids yet they were very experienced in where to get food. The grandmom helped her children to raise children, which largely enhance the human survival and decrease the infant mortality rate.

Another point about the looking powerful man hunter in the tribe, he is not actually feeding his family (if relying on his meanger, unstable hunting gain, most of his family is going to starve to death. Never mention that the successful hunter also has to share his pray with the whole villiage in order to secure allies and turn enemies into friends). The main source of foods is coming from women's gathering fruits and wheats. Then you want to ask, why is man to hunt if there is no actual benefit to raise his family? The answer is very simple, he needs to be the big brother of the tride so he can get sex to reproduce himself. I am just wondering why women tend to pay attention to this type of guy? Hunting well yet not able to raise a family? Does that guarantee a super sperm and super human race? I think vanity is also encoded in our genes.