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Penis enlargement, or male enhancement, is any technique aimed to increase the size of a human penis. Some methods aim to increase total length, others the shaft's girth, and yet others the glans and foreskin size. [1] Techniques include surgery, supplements, ointments, patches, and physical methods like pumping, jelqing, and traction. [1]
A 1990 study of 109 Chinese men identified the average flaccid stretched penis length of 13.9 cm (5.5 in), and among 14 of the men, the average erect length found was 13.7 cm (5.4 in). [36] Another 1993 study of 104 Chinese men found the average stretched penis length of 13.8 cm (5.4 in), and an average erect length of 13.5 cm (5.3 in). [37]
A 2015 systematic review of 15,521 men in which the subjects were measured by health professionals showed that the average length of an erect human penis is 13.12 cm (5.17 inches) long, while the average circumference of an erect human penis is 11.66 cm (4.59 inches).
Sildenafil, sold under the brand name Viagra among others, is a medication used to treat erectile dysfunction and pulmonary arterial hypertension. [4] [8] It is also sometimes used off-label for the treatment of certain symptoms in secondary Raynaud's phenomenon. [9]
[49] [28] [50] [51] Periovulatory levels of estradiol increase sexual desire in postmenopausal women. [49] Based on animal research, progesterone may also be involved in sexual function in women. [52] [53] [54] Very limited clinical research suggests that progesterone does not increase sexual desire and may decrease it. [55]
Due to natural variation, individuals pass through the Tanner stages at different rates, depending in particular on the timing of puberty.Among researchers who study puberty, the Tanner scale is commonly considered the "gold standard" for assessing pubertal status when it is conducted by a trained medical examiner. [5]
Although the refractory period varies widely among individuals, ranging from minutes to days, [4] [5] [6] most men cannot achieve or maintain an erection during this time, and many perceive a psychological feeling of satisfaction and are temporarily uninterested in further sexual activity; the penis may be hypersensitive, and further sexual stimulation may feel painful during this time frame.
Low vocalization fundamental frequencies (perceived as vocal pitch) increase the perception of threat among human males. [ 58 ] [ 59 ] [ 60 ] Controlling for body size, lower male fundamental frequency relative to females tends to evolve in polygynous anthropoid primates, where males compete more intensely for mates. [ 61 ]
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