One direct consequence of men’s susceptibility to visual materials and faculty to differentiate love and sex is their inclination or hope to have as many sexual partners as possible. While women prefer sex within an emotional, stable, monogamous relationships, men effectively have the disposition to seek a variety of mates, just for the sake of variety. In a survey conducted among unmarried American men and women between the ages of eighteen and thirty, for instance, it was established that males wanted to have eighteen partners over their entire lifetime, while women were satisfied with only four partners, i.e., more than four times less. Within the next three years, men stated that ten would be good, versus two for women. And for the next year, men wanted six partners – that’s one every two months – whereas women only desired one. Other researchers found out that men fantasise not less than twice as often as women during sex, and that 88 percent of men admitted mentally switching partners or imagining multiple partners during the course of a single fantasy session (compared to 57 percent for women).
Yet evolutionary psychology and the natural urge to procreate justifies much more than intrinsic promiscuity of males. They both play an eminent role and provide particularly persuasive arguments in the explanation of mating behaviour and of gender differences in human sexuality. For a man, sex usually carries an extremely high priority, as it represents his only alternative for reproduction. In order to achieve this innate goal of passing down his chromosomes to the next generation, he chooses to have sex with a large number of women. Although he might not carry through on this instinct, he certainly has the drive to attempt to inseminate legions of females. For him, having twenty partners means that he can potentially yield at least as many babies per year. Therefore, he has a lot to gain by being easily aroused and by attempting to procreate. For a woman, on the other hand, it makes no evolutionary sense to have 20 lovers, as she can only bear one child every nine months. For her, more sex does not necessarily mean a higher fertility.
Powerful sex drive, easy arousal, quick on the draw, visual stimulation, ability to separate love from sex, preference for partner diversity, capacity to breed at practically any time, any place, and under almost any circumstances, etc. – all these facets of apparent male promiscuity often lead women to think and openly deplore that men are “dick driven”. The late comedian Robin Williams (a man) recognised and circumscribed this problem in a rather humorous way, declaring that God gave men a brain and a penis, but only enough blood to run one at a time… And that’s not too far from the truth. In many occasions, sex does actually supersede male brain activity. This explains why sometimes a man can find his rational thought overwhelmed instantly when he is strongly attracted to a woman. This phenomenon does not occur by accident but can be proven scientifically. According to neuropsychiatrist Louann Brizendine, the space allocated to sexual drive in male brains is two and a half times larger than in female brains.
Considering that a man’s body produces about ten times more testosterone than a woman’s body on average, it should not come as a surprise that the male sex drive is so powerful and urgent, at least from a female perspective. This hormone does not only make men hairier (yet paradoxically provoking baldness), bigger, stronger, and more aggressive than women but also much hornier. In this regard, it may be interesting to notice that testosterone levels in single males (who have not yet succeeded in passing on their genes and are therefore still on the chase) are significantly higher than in married men and fathers (who have moved onto a more nurturing, less aggressive, role). Similarly, human ethnicities with males showing relatively lower testosterone readings (e.g., Asians) have less sex than others (Caucasians, black men), but are also less prone to violent crimes and rape. Reciprocally, the only women who have sex drives resembling men’s – i.e., frequent sexual arousal; sparked off by visual stimuli like pictures or the sight of strangers; in certain cases leading to a pressing need to masturbate; recurring desire; to have casual intercourse; with random people; for bodily gratification – are those with abnormally high blood levels of male sex hormones. This phenomenon, however, applies to less than 20 percent of all women.
What is more, men also have a larger hypothalamus, the portion of the brain that controls functions like blood pressure or heart rate, as well as primordial drives such as thirst and hunger. Together with the amygdala, which is in charge of processing and memory of emotional reactions, they constitute the lust centres in our brain. During arousal, both parts become active, initiating the secretion of dopamine, a neurotransmitter responsible for the feeling of well-being. This, in turn, triggers the release of a cocktail of hormones, including oestrogen and testosterone. The latter is the chemical fuel that sets the brain’s sexual engine in motion, and as such is a key catalyst in the induction of sex drive. When there is enough juice, the hypothalamus gives the signal to fire up the rocket, igniting red-hot feelings, physical excitement and sensual friction fantasies. At that very moment, the whole system is just a few moments away from lift off, and the thruster ready to be drained.
Related proverbs and citations:
shuí dòng xīn shuí xiān sĭ
He who is touched dies first.
In love, there is no equal. The person who loves more will always be the one to suffer.
 Buss (2003), p. 77
 Ellis / Symons (1990)
 See chapter 35 “No cat can resist snatching fish”.
 Brizendine (2006), p. 5
 Pease / Pease (2009), p. 14
 A neurotransmitter is a chemical that is released from a nerve cell which thereby transmits an impulse from a nerve cell to another nerve, muscle, organ, or other tissue. A neurotransmitter is a messenger of neurologic information from one cell to another. (Source: http://www.medterms.com/script/main/art.asp?articlekey=9973)
 A hormone is a chemical messenger that carries a signal from one cell (or group of cells) to another. Hormones are essential for every activity of daily living, including the processes of digestion, metabolism, growth, reproduction, and mood control. (Source: http://www.medterms.com/script/main/art.asp?articlekey=3783)