Primitive life, like bacteria, reproduces asexually. But most animals and plants reproduce sexually, so offspring inherit genes from both parents. Even in plants, the mechanism that allows the male gamete to join the female gamete is engineered by the male reproductive part. There is competition between the male gametes because only one fuses with the female gamete. This is essentially the definition of male and female in biology.

Organisms of only one sex produce and fertilize their own eggs. The male is a later evolutionary development. The first single-sex organisms develop a phallus. Then, over eons, the development of the phallus varies according to the responsiveness of the individual. Those organisms that manage to penetrate another individual evolve towards proactive males. Those individuals who are willing to be impregnated become passive females.

The evolution of the two sexes, male and female, implied that the most active individuals impregnated the less active ones. This is critical to understanding that a person’s gender is related to their overall metabolic rate. The most physically active tend to be more receptive. But psychological arousal is also based on identification with the masculine role in coitus. Orgasm implies a mindset that intends to be the penetrator in sexual activity. This explains why female masturbation is so rare in the population.

Sexual differentiation involves more than the anatomy we are born with. There are differences in behavior between the sexes even in very young children. Heterosexuality is based on the symbiotic relationship between men and women. Male and female sexualities are not the same. They complement each other. Various chemicals, including hormones, emotional control, and sexual response. The male and female brains respond very differently. Many erotic stimuli enjoyed by men are repugnant to women. Most men have little interest in the emotional stimuli that women enjoy.

The male sex role is proactive and driven by a man’s responsiveness over which he has no conscious control. A man must be turned on by his partner so that he can get the sexual release he needs. A man’s sexual role is to approach women until one of them accepts him. Only a male is motivated to mate because he gets turned on by seeing a female. Most men, especially when they are young, are regular and reliable. This arousal takes the form of a firm erection, which motivates them to enjoy getting penile stimulation. This is ideally done through intercourse, but can also be done through masturbation alone.

Responsiveness (the ability to respond to the point of orgasm) is part of the male reproductive function. For reproduction to occur, a sperm (from the man) must unite with the egg (from the woman). This involves:

• A man who has an erect penis (male arousal);

• A man motivated to penetrate a vagina (male sexual desire); Y

• A man motivated to push himself until ejaculation (male orgasm).

The female sexual role is much more passive due to the lack of receptivity of the woman. Their role is based on conscious behaviors. She can choose a mate with more objective criteria, such as whether he is devoted to her and whether he is willing to support her for decades while he raises her children.

The sexuality of heterosexual women involves:

• A motivation to make themselves attractive to men;

• The will to facilitate male orgasm through intercourse; Y

• A long-term wish for company and family.

None of these involve a woman’s arousal and orgasm. They depend on the conscious decisions of women. A woman chooses a partner among men who show interest in her. Afterwards, she keeps him devoted by offering him regular sexual relations. Women do not experience an arousal cycle except through masturbation. Women are not turned on by erotic stimuli in the real world and only respond with a mental focus on surreal fantasies during masturbation. Women focus on companionship and family, especially over time.

The genital tubercle grows towards the penis in a man and towards the clitoris in a woman. The clitoris has no role in reproduction, so it doesn’t respond with a lover. Everyone has a phallus, but intercourse, which dominates our view of sexuality, involves a man inserting his phallus into his vagina. The female orgasm has no function. So it would be weird if it was common. That is why it was first discovered by researchers instead of being a well-known phenomenon in the population. Few women ask about orgasm, which is natural because you can’t miss what you’ve never known.

The average man…has a greater need than most women for a regular and frequent sexual outlet. (Alfredo Kinsey 1953)