What if you found out that semen contains the "life essence" (or extremely vital nutrients) of a man?

This is portrayed in many fantastical settings of course, but this is actually a very real and seemingly recurring belief that spans ancient cultures from around the world (including Japan). I'm not trying to start a war here considering where I am, but I'm hoping a healthy discussion can take place...

I should also note that there exists "evidence", but this hinges on your perspective of reality I suppose.