Tinman
That's a very good suggestion Tinman, I can see your point in making it a bit easier to find if/when we have hundreds of members.
We have a profile builder extension installed that allowed us to create an optional simple textbox questionnaire attached to each member profile. I also agree with @Shocker 's points and that's why the profile information isn't mandatory. Just an extra space to be used if you wish. We DID find something that allows us to build forms, but it is horribly clunky, and I would have only been able to put the briefest and simplest of kink list forms on a profile. It wasn't anywhere near adequate.
Until the form builder is better, or until I commission someone to create a kink-list checklist (which, to be honest here, I'm very reluctant to do for what should be obvious reasons), what we have done is made a new field in the member profile in which to put a link to your list.
To find it, click on your user name in the top right and hit "profile". Then find "member profile" in the list to the right. Clicking on that will take you to the optional profile form. We've added the space down at the bottom.

I'll be interested to see how the poll goes - if enough people really want this feature I will try to figure something out.