The brain is its own pleasure center during sex. Just being physically close with another human being is known to increase levels of oxytocin - the "cuddle hormone" - in the brain, making you feel happy and safe.
Scientists know that certain parts of the brain are associated with pleasure, becoming more active after consuming food or drugs - or having sex.
When we have sex, the physical signals felt by the body send signals through our nerves to the brain - which reacts by releasing chemicals that make us experience even more pleasure.
Some researchTrusted Source suggests the rhythmic nature of sex and sexual stimulation creates a physical-psychological loop of pleasure.
As physical pleasure increases during the orgasm phase of sex, so does psychological pleasure - and more psychological pleasure increases physical pleasure.
The research also suggests that the rhythm of sex can help women and men choose appropriate sexual partners.
A person will tend toward a sexual partner whose rhythm brings them the most pleasure because a good rhythm is a measure of sexual fitness.
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