I have a huge problem about my cheerleader girlfriend?

I am a huge Oklahoma sooners fan and my girlfriend is a senior cheerleader for University of Illinois, and I only get to see her twice a month, but anytime I see her, she wants to have , so I have with her once out of the 2 times I see her each month, but what can i do, because she wants to have each time we see each other? I am freaked out. she is also telling other people at Illinois about this and everyone is laughing what can i do? I live in Norman,OK and I am also seeing a Oklahoma sooners sorority girl, so what can i do? should i break up with my Illinois girlfriend?