Jen Your mum wanting to 'freshen up' marrage -uh sure whatever there are some others here also- but why an unmarried person?
Yes, at least in Spain in that moment belts were almost unknown, and they discovered them almost accidentally.
And she discovered an entire world.
I think that some people will let the belt in "bedroom" and it is OK, but if you wear it seriously the relationship between wearer and keyholder can make you very happy.
The way in that you feel caressed, protected... As girl, at least for me, is the best you can feel.
If you like feel that way, my sister, for example does not (or she says it 😅).
About married or unmarried girls, well I think it is not very different. An unmarried girl should be protected fully and of course a married girl should have the most successful possible sexual life, (I do not believe in some things that I read here), but with the belt you feel protected, important and obviously give "the key" to your partner and let him decide the moment is a very intense feeling.
Ah, and no doubt, I can give the power of decision to my husband but I do not have vocation of martyr and he has to make me happy and full woman.