"Many people believe that it is safe to have sex in a hot tub or Jacuzzi due to the mistaken belief that the heat in a hot tub kills sperm. Although being in a hot tub for more than 30 minutes may slightly lower sperm count, it does not decrease the number of sperm to a “safe” amount. Even with the lower sperm count, a man can still ejaculate 200 to 500 million healthy sperm, and it only takes one to fertilize an egg."
actually heat does kill sperm. "not all of them" but heat does kill sperm..thats why when men are hot and sweaty their balls hang low (the body's way of maintaining them from over heating) keeping them cool and when it's cold their balls shivvle up same thing they cant get too cold either. that's why they shrivel up... to keep the sperm at the right temp otherwise they die..like i said before not all die, lol their are millions in their. if your trying to conceive id stay away from the hot tub just to have a better chance. although that doesn't mean u wont get pregnant