2 Friends KnowI don't have any siblings, but I have two bff's that know I have gotten spanked. I have been spanked with and in front of both of them. There are adults that know such as our pastor, youth pastor, their wives. Our church is very conservative, I'm sure there are any number of kids there who are spanked, but i'm not aware of it on a first hand basis, and i've never talked with them about it.
Aside from that, if any of the kids around town knew, I'd move to a different country. People who don't understand the dynamic don't and won't see anyone else's views as being beneficial, even if they are.