"Biometric identifications using the fingerprint and the anal creases (the distinctive features of anoderm, or analprint)"

As far as I know, one can use the sphincter's unique pattern to identify people to some degree. Exactly the same way we can do so with iris patterns, fingerprints and even ear patterns.

So be careful what you wish for!

https://www.researchgate.net/figure/Biometric-identification...