Nothing. If such an obscure order actually says to "keep them away", it is likely unenforceable.
However, if you want to spend a couple hundred (or thousand) dollars playing your game, you can ask your attorney to request a show cause hearing and you can whine to the court about your jealousy.
I think that's a little harsh.
If the order says that dating partners are to be kept away and he regularly has women around for dinner all the time and/or spending the night, the judge might very well get pi$$ed for a blatant violation of the court order. Remember, you're talking about Texas where there's still a level of 'I'm the judge and if I say you need to bend over and kiss my butt, you'll do it' in that state.
My order (Oklahoma) says that I can't have non-family members as overnight guests. If I had chosen to fight that, the judge would probably not have ordered it. But since we both agreed to it, it became a court order and if I were to violate it right away, the judge could easily find me in contempt (although that weakens as time goes on).
Having said that, I'm pretty much with you - unless there's a SERIOUS problem, I'd be inclined to ignore it. If the nature of the contact is a problem in and of itself, I'd deal with THAT rather than simply the fact that there's a woman around. For example, if it's a different woman every night spending the night when the kids are there, OP could argue that he's not providing a good moral example for the kids (it's TX, remember). If these women are doing drugs or the ex and the women are blind drunk, it creates a safety issue for the kids. In cases like that, deal with the issue, not simply the fact that there's a new woman in his life (and I'm not suggesting that any of those things occurred in this case).