Try being creative. If it reads like an ad people will treat it as one.
The worst ThreADs known to coed are:
1. Where should I stay (especially if people recognize you have been here before).
2. I'm thinking of visiting (sounds way too uncommitted).
3. Look at me (totally uninspired, and usually abandoned immediately).
4. Look at me (bumped over and over and over, etc....).
Can't tell you what is creative, or how to achieve creativity. When you get it right, everyone will see that
But posting in coed is tricky, because if you don't win the locals over, they find it unfare that you're trying to drum up business in coed, while all the local girls are posting their ads.
Just my opinion.
P.S. Nude pics almost always go over well