One of neighbors was a Chef and he actually couldn't have children because he was cooking his sperm at work just about every day. He ended up wearing ice packs on his nads to try and keep them cool. End result was he had to try like Hell during the winter to have kids because the other 9 months were to hot for his sperm.
The only danger that I have heard of is blood pressrue. Of course if you begin to feel light headed get the hell out and jump in the pool. The shock is actually good for your heart.,if your healthy.