If you are an attached person - married, living common-law or in a steady relationship - and you are (or were) active in the "hobby" does your partner know of your activities?
I think this one would have huge regional differences, maybe even sub-regional, between western and eastern Europe, Africa, Asia, Middle East, even Northern States v the deep South. Now there's a doctoral thesis that would be fun to read. And researching it would be fun too.
Since BC is a mixture of all of the above, this may be a surprising poll.