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Tanning is the body's basic physiological response to the effect the sun has on the skin. The melanin in the skin gets stimulated to produce more when it is exposed to the ultraviolet rays of the sun and hence causes the skin to darken as the pigment increase on number...

Retrograde ejaculation is a problem that occurs when fluid that under normal circumstances would be ejaculated through the urethra, gets redirected to the urinary bladder. The bladder's sphincter would normally contract allowing the sperm to go to the urethra and towards the area where there is the least amount of pressure...