I train with girls during bjj all the time, but in a competition it's different. I would never be able to forcefully place my hands on a female, so I would be forced to engage in a competition without giving it my full go. At that point, if I'm not competing to my full capability, what's the point of competing at all? I would have not taken the match as well.
It is not the critic who counts; not the man who points out how the strong man stumbles, or where the doer of deeds could have done them better. The credit belongs to the man who is actually in the arena, whose face is marred by dust and sweat and blood; who strives valiantly; who errs, who comes short again and again, because there is no effort without error and shortcoming.