When it comes to free stuff, you're right for the most part. I'm sure it has something to do with both YouTube's censorship policies (I can understand how a man beating up a woman in a fight, fake or not, could be considered more offensive than your standard porn scene) and the scrutiny of the companies that produce male dominated mixed stuff. That said, if you're willing to pay, there are a lot of good sites. Oddly, the ones that are dedicated to mixed wrestling are usually 90% female dominated.
One exception is Worldwide Mixed Wrestling, I'd say about 75% of the videos are male dominated.
RingDivas used to make excellent mixed wrestling videos, but they've sort of stopped. Still, if you dig through their archives they've got some good stuff.
SLAMminladies.com and their download site are fantastic. They put out at least one mixed match a month, often with the male winning. Their mixed DVD section has also picked up, just check out this preview from their latest release. I WANT
Lastly, there's good old Double Trouble wrestling. If you search (button on the top menu) for anything with The Puma in it, you should be pleased.
Again, those are all pay sites and they don't always have convenient methods of delivery, so unless you're willing to pony up, you're stuck scrounging for scraps on free video sites (that inevitably get deleted). I'm a cheap person myself, so I feel your pain. And no, I don't work for any of the above companies, but I should get some kind of referral pay, right? :)