real talk, I'd kill to have a girl that had been training to make my dick bust since she was 6. Chicks who've been dancing their entire lives are awesome in bed, just think how awesome a girl would be if she had been twurkin' all her life?
Reading that as-is, I feel vaguely angered -- but when I think about it from only a marginally different angle...
Ask any male if he'd like to have sex with a gymnast, and he'll say "yes." Or he'll lie. I'm pretty sure 100% of the male population fantasizes about getting with someone who can get their ankles behind their head, do the splits, bridge, and is incredibly toned and has great endurance.
spoiler (click to show/hide)
Except demi.
...And then I have to realize that all gymnasts have been in training since they were very young, to be able to do what they do. So I have to agree with your initial observation. But trotting out these little girls specifically to look sexy and do a sexy dance, I can't agree with that decision.