I do them both (CD and golf) for the same reason. I enjoy doing them both.
What do I get out of it? I'm really not certain; but, being at peace with myself comes to mind. But, that could well be a copout as I've always thought I was at peace with myself even before I started dressing. All I know is I am extremely comfortable wearing women's lingerie and clothing. I believe if CDing were 100% acceptable by everyone, I would rarely, if ever, wear men's clothing.