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Blunts the initiation of sexual behavior Modulates sexual drive Processing sexual stimuli in conflictuary contexts Modules sexual drive Awareness of tumescence of erectile organs Modulates sexual drive Open in a separate window Therefore, the sensorimotor cortices are involved in triggering voluntary movements during sexual intercourse and in genital sensation, whereas higher order associative areas play a pivotal role in erotic mental imaginary and in the inhibition of sexual pulses. On the other hand, the spinal cord is mainly involved in penile and clitoral tumescence, vaginal and penile gland lubrication, and rhythmic contraction of perineum muscles. Other important areas such as the nucleus paragigantocellularis nPG1locus coeruleus LCraphe nuclei, and periaqueductal gray area, located in the brainstem, are intimately connected to the spinal cord and mainly involved in erection and ejaculation. Finally, with regard to the autonomic system, it should be noted that the parasympathetic system is implicated in erection and female lubrication, while the sympathetic one is involved in ejaculation and orgasm. Female lubrication occurs because of the interaction between neuropeptides involved in vessel muscular tone, namely the vasoactive intestinal peptide VIP that acts as vasodilator and the neuropeptide Y that induces venous vasoconstriction. This process leads to an increase in interstitial fluid, which results in vaginal lubrication Levin, The reward system Analogous to other behaviors, sexual behavior has a beginning, a middle, and an end. All organisms that are engaged in sexual behavior share a common set of principles and endpoints that define the behavior itself, along with particular neural mechanisms that make it successful. To date, a behavior is defined as successful when it is flexible enough to maximize reward and minimize adverse outcomes.

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