I don't really want to be fat, so I stop before I am. I'm not a vegetarian, but I might go through a phase when I'm not interested in eating protein for a week or so, and then I might go through a phase when I eat nothing but steak.
The woman I am currently crazy about was a vegetarian for a year until I started dating her. As is the case with most vegetarians, she had never eaten properly prepared meat, only commercially packaged or otherwise abused flesh.