Yeah I guess. I figured you could use male fluffers off camera for the tg/tg stuff to keep em hard.
Edit: Btw, I hope one day these scenes can look something like this quality and hardcore nasty wise
http://i54.fastpic.ru/big/2013/0126/...5d3e34e7dd.jpg
Replace the actors with 2 hot tgirls and that image is exactly what would win all.