Chapter Seven – Why Do Men Like Blowjobs?

I have commented on cunnilingus but haven’t said anything about women giving men oral sex.  I have pointed out that in evolutionary terms oral sex doesn’t make any sense at all, unless it is about female dominance and women ruling the tribe and feeding first in times of famine.  So would the same be true of women giving men oral sex?  The big problem with this, would be that if oral sex became too popular and we have some men only ejecting their sperm into women’s mouths and never in her vagina, then his genes would never be passed on to the next generation.  So in evolutionary terms, men wanting to receive oral sex, from a woman, makes no sense whatsoever.
Yet, we find women who complain that men only wants blowjobs, and if we look at videos of male pornography we find that it mostly ends with the man or men ejaculating into the woman’s mouth.  And we also find that there are a lot of women who like giving men oral sex.  So what advantage would women giving oral sex to men, be in evolutionary terms? 
Desmond Morris in his book, The Naked Ape, has an opinion on this as well.  He points out that the reason why women wear red lipstick is that when a ape is on heat and receptive to breeding, her vagina also becomes red, so this is a strong visual single and gives a male ape a target, to know where to aim his penis.  So putting on lipstick is a strong sexual signal to men that she is on heat.  He doesn’t go further than this but it doesn’t need a lot of imagination to know in which direction this reasoning is heading.
According to Desmond Morris when women began to walk upright men couldn’t no longer see a woman’s vagina from behind and this produced face to face coupling, as he could now see her vagina from the front.  Now in previous chapters, I mentioned his theory that when women stood upright men got her breast mixed up with her bottom.  The problem is that a woman’s bottom is close to her vagina, but if men were focused on a woman’s breast instead, then the nearest hole he can put his penis, would be her mouth.  And if she were wearing lipstick, then this would make the sexual signals even stronger
If that is the case, then blow jobs are about men getting women’s bottoms and vaginas mixed out with her breasts and mouth and so would end up putting his penis in the wrong hole.  This could be true if women didn’t have any say in the matter and passively laid back and allowed him to do, as he liked.  And as I have previously pointed out, there is no evolutionary advantage for men putting his sperm in a woman’s mouth.  A man who does this is far less likely to pass on his genes than a man who gets it right and puts his sperm in a woman’s vagina.
It is of interest that patriarchal rulers don’t seem to like oral sex, either done by men or women and it was at one time classed as a sin by the Christian church.  Even today oral sex is still illegal in 18 states of the USA. So patriarchal religions and lawmakers do not see oral sex as a benefit to masculine power.  What is the reason for this?
The reason might be that oral sex whether it is the woman receiving it or the man receiving it, does benefit women in evolutionary terms.  I have already explained why it is a benefit for women to receive cunnilingus but why would women benefit from giving men blowjobs?  Apparently sperm contains a lot of vitamins and minerals and to give a list. -aboutonia, ascorbic acid, blood-group antigens, calcium, chlorine, cholesterol, choline, citric acid, creatine, deoxyribonucleic acid (DNA), fructose, glutathione, hyaluronidase, inositol, lactic acid, magnesium, nitrogen, phosphorous, potassium, purine, pyrimidine, pyruvic acid, sodium, sorbitol, spermidine, spermine, urea, uric acid, vitamin B12, and zinc. It even contains an anti depressant called epinephrine, so it would make a woman feel better.  But it mostly contains sugar which is a high energy food.
http://wiki.answers.com/Q/What_is_the_nutritional_content_of_human_semen
Off course in our modern Western world where healthy foods are freely available, eating sperm is not going to be a lot of help to any woman.  But back in the Stone Age in times of rapid climate change, it could make a big difference to the survival of women in starvation conditions, or has to survive on poor quality food. It has been noticed in modern times that women prefer high sugar foods than men.  Could it be because in the past, women had more access to sugar than men, in the form of sperm?
This then, suggests the reason why men like to receive blow-jobs and why many women like giving them, is because in the Stone-Age, tribes that practiced this custom, would mean the women were more likely to survive in times of famine.  And just to make sure women like doing this, evolution has provided an anti-depressant called epinephrine to encourage women to do it often, as it would make them feel happier.  So there is even an evolutionary reason for men liking and women giving, blowjobs.

Update. http://www.newscientist.com/article/mg21829145.300-picturewinged-fy-quenches-thirst-on-sperm.html