AlAyeti wrote:The question can be answered in darwinistic terms.
If a man was having sexual intercourse with a healthy looking woman in the sight of another man, and the other man was of powerful size and strength, then the weaker man could very well lose his place to mate. The sexual feelings in human males finds arousal from visual stimulation as much as reproductive interactions (courting, foreplay) with females.
"Natural morality" can be seen in the Alpha male and Alpha female. They literally drive away other potentially harmful competition.
In human ways and means, privacy is a smart thing.
Hmmmm. I don't think so. in Darwinistic terms, as you say, survival depends upon the strongest individuals being able to reproduce. In your example, the strongest individual is not allowed to reproduce. In fact, this form of privacy allows weaker individuals to reproduce, which would allow this sense of privacy to flourish, but not the physical strength that one needs in order to survive in a harsh hunter-gatherer environment. In fact, the opposite would be true. In order for the strongest genes to survive, it would be necessary for the strongest individuals to make a public display of their procreation in order to display dominance.
And that's just looking at males. Consider females, who would possibly increase their chances for a better mating match by publicly displaying their "affection" for one male in hopes of making the strongest male react in such a way (e.g., had he been reticent beforehand). To conclude, it would be evolutionarily advantageous to display procreation, which is, I believe what was going on, not unlike what happens with other primates. I believe sexual privacy is a societal construct intended to keep civil order.
AlAyeti wrote:Pornography, much like the reactions that inferior pack members in animals display when observing others mating, cause tensions of a sexual nature to rise to a fever pitch.
I believe that pornography is merely a way to simulate the instictive pleasure that one feels when looking at a member of the opposite sex. It, too, is a societal construct.
AlAyeti wrote:In chimps, just watching mating pairs can cause lessor males to rape immature females or younger males. The comparison to the human male is inescapable.
If true, there is no way to know -- without further study -- if this is due to the pornographic nature of the act or the imitative nature of the act.