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FSH stimulates sperm production and the researchers say that these findings suggest that it kicks into gear when it needs to compensate for testicular damage from increasing scrotal temperatures and decreasing sperm counts and concentration. The study differs from previous research on this topic because it includes a larger number of men than previous studies, and because it is the first to go beyond the traditional, narrow focus on semen quality and include information on a variety of indicators of testicular function, such as reproductive hormones and sperm DNA damage. The men were aged between 18 and 56, had an average body mass index BMI of 26, and had not had vasectomies. Each of them provided a semen sample and blood sample on the same day, and they answered a questionnaire that asked about the style of underwear they wore most frequently in the preceding three months. They tended to be younger, slimmer and more likely to take hot baths or Jacuzzis than the men who wore other, more tightly fitting underwear. In addition, more sperm were correctly shaped, although this result was not statistically significant.