His orgasm oxytocin

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PROBLEM : Oxytocin -- a hormone released by the pituitary gland notably during both orgasm and childbirth -- is known to affect our behavior. It promotes bonding, sometimes to the extent of making us conformists. Researchers in Germany suspected that a dose of the so-called "love hormone" during a flirtatious encounter with a sexy stranger might cause us to draw in closer, perhaps going so far as to spark a dangerous liaison. Each of the 57 men had been administered either oxytocin or a placebo via nasal spray prior to the encounter.
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'Love Hormone' Oxytocin May Intensify Orgasms

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The orgasmic history of oxytocin: Love, lust, and labor

These devices can measure the blood flow and neuron activity in the brain. By studying the brain activity of people having orgasms in these machines, scientists have learned some pretty amazing stuff. There's a reason why people tend to feel bolder and less inhibited during sex — the part of your brain in charge of your logical reasoning skills temporarily goes on vacation. This is the part of the brain that is responsible for reason, decision making, and value judgments. This shutdown of the lateral orbitofrontal cortex actually makes sense, as fear and anxiety can interrupt arousal and lead to problems like performance anxiety. Multiple spatially remote parts of your brain are involved in having an orgasm. Medical imaging tests suggest there are multiple spatially remote brain regions that are involved in sexual response.
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Here's What Happens to Your Body And Brain When You Orgasm

A dose of the "love hormone" oxytocin may make people's orgasms more intense, a new study from Germany suggests. In the study, 29 healthy couples who'd been together for at least a year took either an oxytocin nasal spray or a placebo spray before having sex in their home. After intercourse, participants completed a survey about their sexual experience as well as their feelings toward their partner.
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Oxytocin OT is a neurohypophysial hormone with overall unclear physiological functions in the male. Several studies indicated that OT has a key role in the central regulation of penile erection. In this mini-review we summarize its possible involvement in another aspect of the male sexuality: the ejaculatory process. Because OT is released by posterior pituitary at the time of orgasm, we postulate that OT might help sperm progression during ejaculation.
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