Like someone else who is posting a project right now, I am looking to add vBulletin to my adult tube site, which is AVS. Others have done it in the past but it's not a mod offered on the AVS message board anymore. Logins/logouts/signups should be synchronized.
I'd like to have the login handled exclusively by the AVS site, we do not want users to even find the vbulletin login pages.
I'll provide vbulletin. The forum should be installed in a MySite/forum folder. I'll handle linking in the message board from my site, so you'll just be responsible for getting the vbulletin script up and running with the specs I listed above.
If you have any questions, please let me know.