Rhythmic ability is fundamental in sexual selection
The complexity of sexual dynamics suggests that rhythmic ability is fundamental to sexual selection. Rhythmic motion requires a precise motoric effector system, and alignment of forces.
Establishing these rhythms is not an easy task, whether the system is a single body or a separate mechanical system.
The Rhythmic ability of males may have had an adaptive significance, as it corresponds to genetic quality. It could have enabled females to choose the genetic material that would provide more fit offspring. Rhythmic ability could have also been selected for in the context of mating.
Physical exertion is required
While physical exercise is good for your general health, it is also important for sexual climax. For some women, physical exercise induces orgasms. Whether or not physical activity induces orgasms depends on a woman’s anatomy and the type of exercises she does.
The average physical activity that leads to a sexual climax requires a moderate level of exertion. In healthy adults, sexual intercourse can generate an energy expenditure of 100 to 130 kcal. That is equal to six METs of physical exertion. This is equivalent to six kilometers of jogging, a leisurely swim, or stationary rowing, if it is performed at a moderate intensity.
Physical exercise can also enhance orgasms by engaging the core muscles. In fact, exercise increases the activity of the sympathetic nervous system, which increases responses to sexual stimuli. Exercise also releases endorphins and serotonin, two neurotransmitters associated with arousal.
Neural entrainment may be involved
Neural entrainment is a method that involves reprogramming the brain to respond to signals, including sexual stimuli. Neurons respond to music in different ways depending on the genre. The frequency of the music plays an important role, and the intensity of the music has been shown to influence the strength of neural entrainment.
Nuclei in the brain stem control the physiological process of climax, triggering changes in neurochemicals and hormones. The Adam Safron model suggests that synchronized brain activity may be involved in the process. However, other factors may be involved.
The study also found that the brain is able to alter its response to environmental noise. Researchers found that the brains of young and old adults exhibited enhanced neural entrainment to environmental noises, although the entrainment strength decreased with age. In addition, the researchers noted that the strength of neural entrainment increased when the participants concentrated on certain sounds.
The researchers found that TACS affects a large brain volume, and that it may affect lateral brain regions. They speculated that the electrical fields might also propagate to pre-central areas. This finding is consistent with another recent TACS study in nonhuman primates. This study also used local skin anesthesia to study the effects of TACS on neural activity. This study demonstrated a greater strength of neural entrainment than in the previous study with anesthetized rodents. In addition, this new study also noted that TACS may directly entrain single neurons in the hippocampal area.
Female orgasm may have an “upsuck” action
It isn’t entirely clear what causes the female orgasm, but some researchers believe that the action of pubococcygeus muscles is involved. This is a muscular contraction of the cervicouterine walls and may facilitate the transfer of sperm. In evolutionary terms, this may help to explain why a woman’s orgasm increases fertility.
In a popular science book called The Naked Ape, author Desmond Morris asserts that the female orgasm evolved to promote physical intimacy with her male partner. This may also have helped to strengthen a pair bond. As a result, the female orgasm may be more difficult to achieve than a man’s orgasm, leading to selective mate selection.
The origin of the female orgasm is unclear, but there is a strong likelihood that it evolved from the male orgasm. While the biological significance of the female orgasm derives from the stimulation of clitoris during heterosexual intercourse, the exact role of the action remains unclear.