It's just economics. There's a weight limit, you know. Every pound of weight costs about $10,000 to get into low earth orbit. So, you could send up two skinny guys for the price of one fat one.
I don't get why they're not sending kids up there, though.
Anorexic midget kids with no legs! You don't need legs in space anyway!
no, they have to be really healthy and fit
It is simply logical not to overload modules.
Out of 534 people who have ever been in space only 57 are women and 14 are black. That's discrimination.