You're really obsessing about this, aren't you? Posting on Wetset, starting multiple threads here, etc etc.
People have kindly given you a stack of advice so far. Most of it pretty darn thoughtful and caring.
The summary, as I remember it, is you need to figure out what you want to do.
A lot of us see significant problems with your wife's approach, which seems to include wanting to tell you what you should and should not find erotically stimulating. Some of us think that her belief that she can control your erotic desires is a poorly informed and immature on her behalf. The term control freak has been used, possibly accurately. But hey, you married her.
As has been said already, if you love this woman and want to be with her, get a grip on your DL needs without making a huge fuss over it.
Of course, maybe due to something you have not told us or do not know, she is just utterly fucking freaked out by DL and needs to try and stop it for her sanity. We do not know if she is a open-minded woman who likes a wide variety of sex play, or if she is Miss Vanilla in the bedroom. You need to figure out if her problem with DL is unique, or if it is just a manifestation of the fundamental way she approaches sex and marriage.
I and several other posters think your problems with your wife may go way beyond DL stuff. There seems to be a power struggle going on, and poor communication too. If your wife honestly believes that the role of "a wife" is to fix her husband, get him to live right and be a good catch, you have problems.
I've never had to face your perceived problem - DL play or marriage - so I do not know what I would do. But I do remember that when I was young, I could make a huge deal about matters to do with sex. It was all so damn important!!! I was, being young, completely awash in testosterone and quite irrational 90% of the time. I am now a horny old bugger who has great sex with his wife very frequently, but I no longer get all mad if things do not work out the exact way I want every time. Sex - great and frequent. Anger about sex - gone.
I think, like Cricket, that you can save your marriage if you want to. If you do want out, sounds like you are very likely to be "outed" as a DL, according to others.
But I mainly think that you need to figure out if the whole thing was a mistake outside of this DL crisis, and proceed from there.