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In experiments with rats it has been observed that after vigorous copulation with a new partner, male rats soon completely ignore this partner, but when a new female is introduced, they immediately are revitalized - at least sufficiently to become sexually active once more. Another experiment indicates that the cause of this effect may be a rush of dopamine. This reaction tends to be immediate in males and delayed in females.

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Another experiment indicates that the cause of this effect may be a rush of dopamine.

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Most of this activity is in the limbic system, the oldest part of the brain. Menopausal symptoms, even when estrogen is sufficient.

These hormones can also have different but generally related functions. Oxytocin levels fall after conventional orgasm but remaining in close contact may help to counter this drop and sustain oxytocin levels. The Benefits of Oxytocin.

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PEA is produced in greater amounts when one is in love; conversely a deficiency common in manic-depressives causes unhappy feelings. The time-honored solution to this problem is loving sex without orgasm. Initially, during the honeymoon period of our relationship, we remain strongly bonded by high oxytocin levels, and quickly overcome our hormonal blues by having more sex. Female rodents for instance flirt more and present themselves more attractively when observed by new males than in the presence of males with whom they had already sex.
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  1. Oxytocin leads to strong pair-bonding. During this time we may be more irritable, dissatisfied, anxious or depressed, and instead of seeing the good side of our mate, we may now be painfully aware of his or her shortcomings.