There's a list of interests available. Many couples fill these out and share them with each other, looking for match ups, and in some cases, one doing for the other and at the same time strtching their own boundaries. With some, the sub fills it out and the Dom uses it as a guide.

It's been a while since I've looked at the list myself, so I'll go off and try to find it... but I'll bet someone gives you a link or bumps it to the top of a thread before I get back.