Testicular atrophy is one such issue, although many of the studies suggesting it does cause shrinkage are relatively outdated — from the 1980s. Nevertheless, the majority of it suggests that smoking weed lowers testosterone levels, either directly or through precursor hormones; or causes testicular atrophy in monkeys and dogs. A study from 2012 revives this idea, and finds some evidence in men living in the Niger delta area of Nigeria. In that study, 75 men who smoked marijuana were also likely to have shrunken testicles, infertility, and even male breasts.
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The scrotum is the sac of skin that hangs below your penis. Your scrotum holds your testicles and keeps them at the right temperature. If it’s too cold, your scrotum pulls your testicles closer to your body. If it's too warm, your testicles hang away from your body.
Your scrotum is covered with wrinkly skin and hair. Your scrotum can be big or small, have a little or a lot of hair, and vary in color. Some people’s scrotum is larger on one side than the other.
The scrotum is super sensitive, so any hitting or twisting is extremely painful. But many people like having their scrotum gently touched during sex.