shelleycat
"M" (as you put it) is completely normal and a wonderful way to celebrate our sexuality, give our fantasies free reign. It's a great cure for headaches and insomnia.
Now as for your wife, do you mean that she cannot have ANY kind of sexual intimacy with you until she's had a few glasses of wine? Sounds like she is where I was many years ago. I refused to get married because I felt I would never get over my sexual phobias in a marriage, which tend to get comfortable, know what I mean? I went from dreading penetration to totally loving it and getting kinky even. ;)
First of all, you have to ask her if she wants to change, and make it clear that you support her and love her either way.
Then, you have to get her to tell you what exactly she loves, likes and dislikes about sex. What she thinks during sex. how she thinks if she didn't have the wine. What those little voices are telling her. Ask her if she feels like she has total complete permission to feel anything and do anything in the bedroom. It would help if there was mood lighting, wine and chocolate while you did this.
Just listen, don't respond. Hold her, stroke her, it may help if you're spooning and not face to face.
You may have to be somewhat assertive to get her to tell you this. Just ask her, if not you, whom?
Make an appointmnet for you to respond to everything she said. That's the second tryst, for you to discuss it. The first is just for her to open up without fear of judgement or shock or what-all. Don't be a male and try to argue what she says, apply logic, or solve problems. She just has to be heard. Make sure she understands this is the point of the tryst before you begin. Show her this post in fact and ask her if she'd like to do it as I describe.
Hope that helps!