From the dawn of history to present time, man has relentlessly pursued his desire for sexual satisfaction. We are tempted to believe that his constant engagement in sex may have molded his personality.
Gradually, man's outlook on sex has undergone some changes. For instance, once Britain banned publication of 'Lady Chatterley's Lover" by DH Lawrence' in 1920's. However, glossy magazines have conducted extensive research on various aspects of sex, and, consequently, have contributed a lot to better understanding of sex.
Prior to these researches, in other parts of the worlds, kings had harems where they kept their women. Obviously, these kings, warlords, etc badly needed effective aphrodisiacs to enable them to rotationally sleep with their women. Additionally, eunuchs, castrated men, taught the tricks of the trade to feminine novices.
Despite the teachings, we find some accounts in event books that a junior king living in Herat, Afghanistan, around 1485 had said, "During the intercourse, she behaved shamelessly, i. e. she moved her hips rhythmically. I was wondering who was actually f-ing who. Therefore, I never touched her again!"
On the other hand, we still find female circumcision in Africa and some Middle Eastern countries, an act which kills the desire for intercourse in the mutilated females.
Putting these contradictory notes side by side, we may conclude that some males choose to wait for their partner to come along, while others, mostly self-centered, give no damn to their partner's desires.
My hypothesis is that the latter, normally found in barren lands and under direct hot sunshine, greatly differ from their peers living in regions where humidity is high. Since a cell functions on the basis of osmosis, the tendency of a solvent to pass through the wall of a cell, the DNAs of these people must be very dry, in quest of water.
Perhaps, after thousands of years, this deficiency underwent some mutations, and turned the dehydrated cells into possessive men. Men in these regions, latitude 45 degrees and less, quickly flock around anyone who can guarantee perpetual sex. These men have been able to destroy many civilizations outside their zone.