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Ever wonder why you fall dead asleep or get a rush of self-confidence right after you have an orgasm? It's because of endorphins, oxytocin and other substances that are released into your bloodstream upon liftoff.
There are a host of sexual chemicals that affect your mind and body during and after sex. Check 'em out. What it does: Prolactin relieves sexual arousal after orgasm and takes your mind off sex. It rises sharply immediately after orgasm in almost everyone.
It's one of the few moments of the day when we men aren't preoccupied with sex. How it makes you feel: Prolactin disengages you from sex after an orgasm, allowing you to think of other things besides the naked woman right in front of you. If after sex your mind is flooded with activities and chores you need to accomplish that day, that is prolactin at work. Just imagine how much more progress we could all make in our lives if they pumped this stuff into the water supply.
What it does: Secreted by the pituitary gland, oxytocin stimulates the prostate, causes muscle contractions and sensitizes nerves. Research has shown that increased oxytocin produces more intense orgasms. How it makes you feel: Oxytocin is known as the "cuddling hormone" because it causes you to feel a connection and bond with your lover.
It's also found in women's breast milk, helping to create a bond between baby and mother. If you enjoy cuddling with your girl after sex, chances are you know the effects of oxytocin well. What they do: Endorphins are a group of neurotransmitters formed within the body that bind to opiate receptor sites in your brain to naturally relieve pain.