Men who reported often moving heavy objects at work had 44% higher sperm counts

Oh well. I don't want kids anyway :P

In fact I think manual workers are often more traditional people with more interest in family life. It certainly seems to be the case around here. They have this macho mentality whereas us office workers seem much more sensitive and hippie.

I wonder if that could indicate a reverse causality? Could men with higher hormone levels be more attracted to this type of work? I'm not sure of course but I wonder about it now.

It's fairly well accepted that working out with heavy weights temporarily increases free testosterone. I wonder if that's the mechanism or it's something else entirely.

First impressions: 44% is a lot!