I've sexed all 8 of my snakes and the ones who have been sold to me as males had hemipenes and the ones who were sold as females had no hemipenes. I bought her around 2005 from Port Credit Pets back in the day when they still had a retail location. They are respectable breeders in my area and still do reptile shows. There are no hemipenes when I pop her myself but yeah I could be wrong.
In terms of behaviour, they seem like they're fighting to be on top of each other. The female also excreted some white stuff that seems to be around the tub while she's thrashing but I think it's just urate.