main pages and submit pages link trades are available on:
1)
http://www.my-hot-spot.net/
2)
http://www.hot-sex-directory.com/
3)
http://www.free-porn-directory.net/
4)
http://www.hot-xxx-porn-directory.com/
These are good for both traffic, PR/LP boost and for submitting your free sites.
For traffic trades without PR or LP boost, submit your sites to
http://www.pornificent.com/