What makes sperm tight

In Singapore, in about 15 per cent of couples, the woman cannot get pregnant after a year of regular, unprotected sex. Men have their issues, too. Worldwide, sperm counts have been dropping steadily in the last 50 years. In fact, 10 to 20 per cent of all men have a sperm count below the WHO cut-off level for male fertility. Their semen, or ejaculate, only contains fluid from the seminal vesicles, with no live spermatozoid in it. The good news is that most men can do something to improve their sperm count and sperm quality.
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Tight underwear really is linked to lower sperm counts in men | New Scientist

Wearing looser underpants could be a simple way for men to improve their sperm count and the hormones that control it, a US study suggests. Sperm production is known to be sensitive to temperatures above 34C 92F , which is why the testicles hang down away from the body. Some styles of underpants, such as jockey shorts or briefs, bring the scrotum nearer to the body, causing the testicles to warm up, while others, such as boxer shorts, are looser and cooler. Researchers, who took into account other factors that can affect sperm, including age, body mass index BMI and habits such as smoking and hot tub use, speculate that the higher heat inside pants is the root of the problem. The findings suggest that this hormone kicks into gear when it needs to compensate for increasing scrotal temperatures and decreasing sperm counts in tight underwear. Prof Allan Pacey, professor of andrology, from the University of Sheffield, who was not involved in the study, said the different levels of FSH among men with different types of underwear "suggests that the tight-pant wearers have evidence of testicular damage".
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Tight underwear really is linked to lower sperm counts in men

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By Sam Wong. Men who wore boxer shorts had a 25 per cent higher sperm concentration, 17 per cent higher total sperm count and 33 per cent more swimming sperm in a single ejaculate than men who wore other types of underwear. Sperm production is extremely sensitive to temperature, and requires temperatures a few degrees lower than the temperature inside the abdomen.
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