I'm going to demand that my girlfriends gymnastics routine be less sexy
Do you have a reason for this?
Yes, I don't want her to be sexy with other people's eyes focused on her.
I get your point, but it's unhealthy to try and control people. She should be allowed to express herself however she wants.
Seeing her in the gym with other people looking is demeaning to me. I'm still a man and I can't allow that in my presence.
It is wrong to try and control other people. She has the right to preform how ever she wants. Maybe she isn't a good match if you feel insecure about her.