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Published 16:31 27 Apr 2013 BST
Updated 08:13 18 Dec 2014 GMT

It's a topic of conversation that features on nights out, TV nights in and, yes, there was always one person who tried to broach it with the fifth year Biology teacher.
Which hurts more, childbirth or getting kicked in the goolies?
But the truth is there is not one person, not ONE, on the whole earth that can answer it. Imagine that.
So that's where science comes into play.
This video should explain all, although we know you could be disgusted with science's decision on the matter...