Not enough people interested in BDSM? People in alternative sexual practices won't fill out surveys? Come on! I definitely agree with Joe that with a handful of sites, you could find hundreds of respondents. 18 in 36 hours, and that's on Christmas Eve!

Another one is bondage.com. You can register free for access to the message boards.

I took the survey, and I would be interested to learn more. Is there much research about BDSM? If not, is it just because people don't want to talk about it? Personally, I would very much like to learn more about it and try to de-stigmatize it. Our society has (more or less) embraced normal, consensual, heterosexual sex; but we still frown upon anything out of the norm. As a consequence, sexual "offenders" are treated like lepers--I realize that rapists and pedophiles are dangerous, but I think we punish them disproportionately to their crimes and try to push them out of sight. Then, we squash the free expression of "alternative" sexuality (fiction, art, etc.) even when it doesn't harm anyone. It's definitely something of interest to people on this site!

I think you're very brave for approaching your professors with this and pushing ahead even if they weren't crazy about it. Good luck, and please share more!