Being a woman, from what I read here, it seems that for the most part there are a lot of men here without a clue! I do not mean that is a snarky way. It just amazes me that with so much information at our fingertips, literally, we still have no clue about each other on the most basic levels.
But firstly I think you would be amazed at the number of women who love to watch/read and are turned on by male on male porn. Probably equal to, possibly even surpassing the number of men who love to watch/read girl on girl porn.
For the most part women are turned on by an authentic response, especially in sexual situations. Men cannot, as women so often do, fake a response. That is the key.
Secondly, I think it is the very same for men. It comes down to authentic response.