The claim
Wearing a tight underwear lowers a man’s sperm count
Rating
True. However, its link to infertility remains uncertain
Reviewed by First Check ↗ ·
Original fact check ↗Original review summary
The review reports that tight underwear can raise testicular temperature and may affect sperm quality and production. It says the direct link between this temperature increase and infertility remains uncertain.[S1]
Additional context
The review says tight underpants may raise testicular temperature by 0.5 to 0.8 degrees Celsius, but notes that whether this is enough to cause infertility is unclear. [S1]
Research date:
Sources and attribution
- [S1] First Check original review
Original review · Retrieved October 16, 2026