sheken

I was trying to cancel an old credit card and I noticed a recurring charge I have for something I bought many years ago but never used since I never started doing adult:

basically I have registered the number: 1-800-BUT-TSEX

I don't recall exactly why I got it but nevertheless, it's there.

It's obviously not as good as a domain name and I have no idea if it's worth anything and if so, where can I sell it.

Any suggestion is welcome!