Searching the plain, flat text of the Boards, Reviews, PMs (Private Mails) should all be do-able but it hasn't been done. I have proposed that the next TER software upgrade -- FORUM and PM only, not Reviews --  should be to free, open-source forum software: free, large community that maintains it, debugs it, adds new features, helps new users migrate their old Forum software to the new Forum software, ...  
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I searched S&P for "flat;text" and here just a few of the hits:  
http://www.theeroticreview.com/discussion-boards/suggestion-and-policy-4/plagiarism-checker-for-ter-admin-to-check-reviews-14632
http://www.theeroticreview.com/discussion-boards/suggestion-and-policy-4/two-separate-requests-i-think-14486
http://www.theeroticreview.com/discussion-boards/suggestion-and-policy-4/yes-it-has-been-suggested-and-requested-before-14354

The first reviewer may have put "Don't Know" for anal because he didn't want to do it or it wasn't discussed.    But subsequent reviewers mentioned "anal" so that is the proof that is necessary to change the anal field from "Don't Know to "Yes."  You will be making the profiles more accurate...especially for guys who want to do anal.