What if I purposely put my pants in the dryer before wearing them?
Why put on hot pants?
I wanted to see if it's harmful for health because I heard that heat can kill sperm.
While it is normal to dry your clothes before wearing them, it isn't normal to wear the while they are still hot out the dryer. You should let the clothes cool off before wearing them.
I don't think anyone is going to see that as a fire hazard.
Fire isn't the issue here. Pants that are extremely hot could burn your skin. Don't you think it would be better to wait for the few minutes it would take for your clothes to go from hot to warm?