Because I'm an asshole I always say no to taking off my shoes and the backscatter xray. Worst that happens is - surprise! - a secondary where they bomb swab my shoes and look at my carryon. Principles, dammit.
Speaking off assholes and penises - there are existing algorithms for genital, butthole, blowjobs and breast detection in pictures. It could even detect revere cowgirl. It's crazy.
I wonder if this is what they're using? Commercial license was around $3000 and is a good match to block the pervs.
One of my great ideas is to buy the library for it and run it against a large corpus of porno vids. Not sure how to monetize that one.
Since this is wickedfire, I guess you could scrape the porn and use it as an autotagger for your pornhub/redtube clone.