oxytocin

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Sex’s Physiology

Published January 24, 2013 by Tony

SEX ROUSES SEX
Sex’s Physiology

Saying that sex stimulate sex itself may sound strange but it’s true!
So, Viagra aside, if you want more arousal and wish to have more sex, you should have sex…. and more frequently! Like any machine, each human body’s part works better if regularly is made operated.  It is not me to say this, but the complicated chemistry of our body and what happens during a sexual act, which I will try to explain briefly below.

From the moment an intercourse has begun, a lot of physical and chemical changes already have occurred in man’s body.
The first to work are Pheromones, chemical substances produced by both sexes that trigger the physical attraction. The same substances that attracts the male animal to the female when in the fertile period. Among them is the Phenylethylamine, a chemical stimulant responsible for the euphoric state and excitation, which stimulates the libido through the release of Dopamine, another chemical neurotransmitter that, in turn, promotes the synthesis of Testosterone, the king of sex hormones.
After the state of “well-being” due to the dopamine, comes a general agitation caused by Norepinephrine, widespread

molecule in the nervous system, especially the hypothalamus and the limbic system. This molecule causes excitement, euphoria and enthusiasm, but also promotes contraction of the sexual organs’ veins and keeps the blood to sustain the erection. The Noradrenaline regulates the production of Adrenaline which causes an increase in heart rate, respiration and blood pressure, often giving rise to the redness of the face.
guy penis erectionOur body starts to produce Endorphins.
Meantime, the erection has led to the activation of two portions of the spinal cord: a “sacral center” that sends direct impulses to the penis, keeping vasodilation, thanks to the stimuli sent by the glans; and a “lumbar center” which is receiving some pulse from the brain activated by visual, olfactory, tactile and auditory excitement. The arousal, to stay alive, needs constant reinforcement of the fulfillment that is guaranteed by the stimulation of a bundle of nerve fibers, sensitive to dopamine, which runs below the cerebral cortex. It is a fundamental structure of the brain stem with an associative function, which is not exclusive of the cortex. The Endorphins are chemicals produced by the central nervous system and equipped with a powerful analgesic and exciting activity, therefore act as “natural anesthetic” with benefits similar to morphine and other opiates (relieves pain and gives physical well-being). This is the reason why during each sexual act any man has more vigor, and as if anesthetized feels less pain while all the other organs of the body seem to be paused, as if the only purpose is to go ahead and complete the sexual act. Mind, body and senses, overwhelmed by these hormones and the great excitement, go in a limbo!
After the ejaculation the amount of endorphins and Oxytocin increase considerably.

CLICK ON TO SEE EJACULATION

CLICK TO SEE EJACULATION

Oxytocin is a hormone produced from the rear of the pituitary gland that stimulates the genitals. It is called the “love or cuddle hormone” because also generates feelings of affection, protection and well-being in the pair, which above all, strengthens the love’s emotional component. This hormone participates, at various levels, to the sexual response, favoring the orgasm, through the activation of the limbic system. Prolactin, like serotonin, in contrast with oxytocin, does not promote sexual arousal and is sometimes responsible for erection issues. Normally, the hypothalamus produces a factor that inhibits the secretion of prolactin and so, when the prolactin increases, it means that the hypothalamus is overstimulated. This can happen for a reduction of the dopamine (as in the case of depression); it is precisely this neurotransmitter which stimulates the production of the factor inhibiting the prolactin. It usually happens by the use of drugs such as beta-blockers, antidepressants, anxiolytics or anti-ulcer which increase prolactin secretion. The increase in oxytocin inhibits arousal from which the deflation of the penis, and this hormone is also responsible of the refractory period (recovery time) following the ejaculation, blocking libido and erection. The increase in endorphins, similar to morphine and heroin influence, reinforce this effect, and this is the reason of lack of interest to sexual activity of heroin addict people.  Unlike men, some women do not experience a refractory period immediately after orgasm and in many cases are capable of attaining additional, multiple orgasms through further stimulation. As average, young men (16 – 22-years-old)  have a refractory period of about 10-20  minutes, that then increasing with age, till to need more than 20 hours for older men.
Orgasm is without doubt the most complete moment of
abandon/isolation for human being. At that moment he is not afraid of any danger, with eyes closed and cessation of any cognition. The individual, for a moment, abstract himself from the environment with a high threshold to pain, because of the endorphins. For everyone, “the little death” (petite mort), as it is called, is, paradoxically, a short moment of absence which coincides with the maximum externalization of his biological being, because taken from the act of procreation which is the ultimate and most important goal of his existence.
It should be noted that sex hormones are produced in direct order of the brain, not for nothing it’s said that sex is made by brain. The starting unit resides in the hypothalamus which calls for the anterior pituitary gland to emit two distinct sex hormones. The first is the FSH, follicle-stimulating hormone, that in the male acts in a part of the testicles, promoting the production and maturation of sperm; the other pituitary hormone is the LH, luteinizing hormone, which in the male stimulates the production of testosterone by the testes.

At the end of any sex act, therefore, we will have different circulating hormones, which in addition to promoting the production of new semen, have increased levels of testosterone and those pheromones which, as mentioned, increase sexual stimulation. This is the reason why pubescent boys, who blessed do not need additional arousal, become easily masturbation-addict, if they do it very frequently. Do you have ever got another erection after a sex intercourse (recovery time permitting) or still lust in the immediate aftermath?  Staying in circulation, these chemicals promote, later in time, excitement and desire to have sex again. Subsequently,  you even could notice a turgid penis, due to the better blood circulation inside the penis.

Just sex that stimulates other sex.
As if to say, appetite comes with eating.

ORGASM & LOVE

Published October 27, 2011 by Tony

Brain during Sexual Intercourse

male_and_female_brains

What does happen in the mind of a woman during a sexual intercourse?

In addition to cinema and literature suppositions, we now have a scientific answer thanks to a research of Rutgers University (New Jersey).
To unravel the mystery, the scientists scanned the brains of some women while having sex, and found that during the orgasm, up to 30 different parts of the ‘grey matter’ are activated. Included those responsible for emotion, touch, joy and memory.
A ‘mix’ that, after the intercourse, make women more likely to fall in love with the partner than men.
The scientists also found that two minutes before reaching orgasm, the same areas that ordinarily work when we eat or drink also is affected in the brain.
“Just before women reach the apex – the study says – even other areas of the brain are affected by strong ‘vibrations’ due to the arousal, such as the sensory cortex”. This brings the nervous system to become dull to the point that no pain but only pleasure is felt.
The last part to become active is the hypothalamus – as scientists say on an article published on the British newspaper the ‘Daily Mail’ love-on-brain-111610the area delegated to the ‘control’, but at this point, woman has already been conquered. This study gives us now the scientific reason why women need cuddles and look more loving after the sexual act.
The key hormone “oxytocin” released during sex is also known as the ‘cuddle hormone’. This lowers our defences and makes us trust people more, says Dr Arun Ghosh, a GP specialising in sexual health at the Spire Liverpool Hospital. It’s also the key to bonding, as it increases levels of empathy. Women produce more of this hormone, although it’s not clear why, and this means they are more likely to let their guard down and fall in love with a man after sex.
For women especially – the mind plays a key role in achieving orgasm. The key to female arousal seems to be deep relaxation and a lack of anxiety. For men, instead, the intercourse and the orgasm leads the nervous system to produce more dopamine, the pleasure hormone, and this surge even can be addictive.This is the mainly reason of man’s urge in searching sex.
Funny! I’m sorry people! All that , let me summarize that – for women sex is mental, for men an addictive need.
The next challenge for researchers is to map the brain of the men, always at the most ‘hot’ times. But, in this case I guess that the hypothalamus just will be the first brain’s area to work…..

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