Jon, I hear you talking a lot about what you will do with this new knowledge.
What is your wife willing to do for YOU? She has now unilaterally forced you into a sexless marriage. Is she okay with that? Does she have any plans to 'help' you out from time to time? How can she, if she truly loves you as you say she does, live with herself if that is her plan?
It seems so heartless and selfish to me.
I get what you're saying about the headache and all, but IRL if you did have a headache, you'd probably reach for the bottle of aspirin.
As far as women checking out other women, my vote would be that they do it simply because women are beautiful. I check out other women for a variety of reasons, from liking the shirt they have on, to thinking they have a killer booty, to wondering why anyone would think it is sexy to have your thong hanging out the back of your pants. Mostly just cause they're beautiful, though. I also check out cars fresh from the carwash and this new church up the street that is absolutely stunning.
Again, Jon, I don't think that her being aroused by women makes her a lesbian. Can you broach that convo with her and see what comes of it?