Fantasy Abduction only had 155 people looking for it last month. There's nothing remotely related popping up for "kidnapping." A "spanking scene" was getting 733. I think you'd probably be best just going after a big one like bondage or BDSM.

Check here they may have something that will help:

http://www.boundandgagged.com/

http://www.nybondageclub.com/

I think if you go too specific you'll end up missing a lot of people who may have searched for a board term like BDSM or bondage.

And BTW, you might want to tell them an affiliate program would help. I would like to promote it and I have thousands of kinky tromping through my sites every day.

Thanks
dzinerbear