A low sperm count isn't necessarily a *bad* thing. Its only low for a short time. Its not permanent.
Just like your count is low after you get your freak on. The next day... you're good as new.

I guess if you're trying to have kids... then it can be a bad thing.
But for us who are not trying to have kids... we shouldn't care one bit.

Your sperm count will go back to normal after you reduce the heat.

Sitting in a hot tub or sauna for prolonged periods of time will also lower your sperm count.
Does that mean that you should not use a hot tub? No... just don't use it if you're trying to have kids...

The only time it will really matter... is if the guy already has a problem with a low count under normal circumstances.