I understand what you're saying, and it is a possibility of course, but it is entirely two different things for someone, male or female, to be of low-desire versus being homosexual. Moreover, if Didi should start taking that tact in her thinking and she guesses wrong, she can pretty much kiss her M goodbye. That's not a question to take lightly -- especially given how fragile the male ego can be regarding such matters.
For what it's worth, I got wind of my xW talking to her mother and sister about me just prior to our D -- she was insinuating that my inability to jump through her particularly odd set of hoops to gain time for ML was supposedly an indication that I was less of a man ("If he was really interested in having sex with his wife, he would have done everything in his power to accommodate his W. So there was obviously something seriously wrong with him.")
My ego is not really as fragile as it might be for some men about these things, but if nothing else convinced me there was no way in H*ll we would ever get back together, that surely did!
[Edit: this conversation is moving too fast for me -- by the time I manage to key in a response, some other bit of information comes to light that makes part of what I say irrelevant. Like the fact Becca has already broached the gay question with her H.]