Yeah, I did my first ex post recently, and it gave me a little thrill at first. I wasn't nervous about showing my body to TFP'ers, but I was scared about the picture being distributed elsewhere on the web. I did my best to make it as anonymous as possible, even though there's no 100% guarantee (more like 75%, I bet) that people won't spread it around. You take your chances, I guess.
You also have to ask yourself if you will be okay with a lot of men making the same kind of comments they make on the Titty Board... it can be flattering, but it is a different kind of feedback if you are not used to it.
Otherwise, if you're all cool with that stuff, GO FOR IT!!!
You only live once.