Tight Pants or Underwear
When you’re trying to conceive, it’s best to forgo tight underwear and skinny jeans in favour of boxer shorts and loose pants. One study found that induced testicular hyperthermia (in simple terms, the testes become too hot) caused by wearing extremely tight underwear for 120 consecutive days lead to declines in the number of motile and viable sperm as early as day 20, and overall sperm count by day 34. Over the course of the study, some participants even saw a 100% reduction in sperm count. But don’t worry if tight undergarments are part of your wardrobe: the sperm count and viability of study participants returned to normal 73 days after forgoing the hyperthermia-causing drawers.