Okay, well is he taking any of her feelings into consideration?

An emergency hysterectomy can be traumatic for a woman, especially if she's young. She may no longer feel like a real woman (sounds insane, right? But, it's a common reaction. While her feelings may not be logical, they are certainly valid).

There's also the issue that she is no longer producing estrogen, and estrogen is a key hormone when it comes to the sex drive of a woman, just as testosterone is a key hormone in a man's sex drive.

Interestingly enough, a man called into Playboy radio yesterday with a very similar situation. He knew there was an estrogen patch for women who are in this situation, he asked his wife to try it and her rebuttal was "hormone replacement therapy causes breast cancer". She shut down the entire conversation in one sentence. At the end of the call, it pretty much sounded like she had given up on the idea of sex and that she was rather content with that choice.

And this very well could be the case with your brother's girlfriend; she might actually be relieved to no longer want sex. Some women just don't place a lot of importance on it and think it's something that isn't important in a relationship, she just might happen to be one of them.

In either event, I don't think you should be getting involved. It's his relationship and they need to work it out. I don't think I'd be very thrilled if my husband was discussing our sex life with his sisters, regardless of the intentions he had.