Sexual Intimacy and Procreation

Key Insight

Rob and Julia's physical intimacy involved an intense awareness of each other, leading to mutual arousal. Male desire, exemplified by Rob's, is generally 'pretty steady', with a notable 45 percent drop in observable indicators (like strip club tips) during a partner's menstruation, though the reason is unclear. Rob's longing for sex was profound, extending beyond a 'Darwinian reflex'; it served to dissolve his internal communication barriers, enabling him to feel and express emotions for Julia unselfconsciously, particularly during shared passion. He found true satisfaction not in 'quickie acts of copulation', but in the 'bliss of unencumbered communication' that deep intimacy provided, aligning with the idea that men need sex to feel loved.

Julia's desire was multifaceted, likened to a 'river with many tributaries', influenced by physiological factors such as testosterone levels and serotonin processing, alongside psychological states like mood, daily busyness, and social interactions. Her arousal was also subtly affected by external stimuli, including art, music, or nature, and she became lubricated by nature shows of animal copulation, despite conscious repulsion. Notably, her sexual preferences were more susceptible to cultural influences than Rob's; while men's sexual acts remain consistent across education levels, highly educated women are more prone to engage in oral sex, same-sex activity, and other experimental behaviors. Conversely, religious women are less adventurous than nonreligious women, a distinction not observed among religious men. The notion that 'foreplay for a woman is anything that happens 24 hours before intercourse' highlights this complex, extended lead-up to intimacy.

Orgasm is described not as a reflex, but as a 'perception, a mental event', initiating a cascade of intensifying physical and mental feedback loops. This process releases neurochemicals like dopamine and oxytocin, culminating in a 'complex and explosive light show in the brain'. Remarkably, some women can achieve orgasm through purely mental means ('thinking the right thoughts'), or through unconventional stimulation, such as their ears (in cases of spinal cord injury), or even paralyzed genitals. Extreme examples include a woman in Taiwan experiencing orgasms and temporal-lobe seizures from brushing her teeth, and a man feeling orgasms in his 'phantom foot' after amputation, due to brain plasticity. Julia possessed traits associated with ease of orgasm, including a 'willingness to surrender mental control' and 'inability to control thoughts during sex'. During lovemaking, both experienced a partial shutdown of their frontal cortexes, heightened tactile senses, and a loss of self-consciousness, leading to 'satisfying climaxes' and ultimately, the conception of a son.