Most providers would allow that, I think. Don't assume they all do though.
We have many sets that are under $17. Lots of exclusive amateur girls who we discovered. Many sets aren't amateurish, but many are.
Here are a few of the more-amateurish sets of one girl:
http://www.xphotography.com/angie/95/
http://www.xphotography.com/angie/58/
http://www.xphotography.com/angie/60/
Guys will want to see average girl Tess because she has huge natural tits.
http://www.xphotography.com/tess/
Natalie is hot. But young and doesn't look like a stripper in most sets.
http://www.xphotography.com/natalie/