adult/glamour photographers don't need anything for their 'portfolio', hobbyists and beginners do. there are a ton of hobbyist nude photographers, many who are very good, out there who would probably love to do a shoot with you. maybe some near you.
check out
http://www.garageglamour.com lots of pros also post on their messageboard.
Your best bet would be to do a barter deal with a photographer who has his own paysite where you can shoot sets for your site, sets for his site - you get content , he gets content.