How about this scenario: I am me. I wear women's underwear every now and then just for fun, but it stays in the closet. I'm found out by my girlfriend, who dumps me. I am alone, and ashamed. I truly loved her, and I feel awful about her leaving me. And I miss her lingerie, too. So I vow to never wear women's clothes again.
Of course, as always, I fail. I know that it's impossible to change this proclivity. I keep succumbing to the urge. Until one day, I finally decide to do something drastic about it. So, I say to myself, you want to wear women's clothes for fun, eh? Well, we'll see how fun it is if you wear them all the time. So I start wearing women's underwear exclusively, hoping that I'll get sick of it and stop. Only it has the opposite effect. I wear it all the time, and I get so used to it, that I can't do without it. I come out of the closet forever as a girl, just because it's just too fun to give up.