Here's a few BBW (big beautiful women) links for you.
I can't guarantee that you won't be offended, but none are "porn sites"
Enjoy
Wuzzles World A BBW friend of mine
BBW Singles BBW singles site
Big Women Good site, but it does have some content that may offend the more prudish types
Custom erotica from your fantasies
Uppity Women Not strictly BBW but quite interesting. (g)