Laura But still why might you need it for?
As long as I know,I'm the first(and maybe the only)woman in our family to have to wear it.So I guess my parents were less experimented about it.They may have thought it would have been useful if I can't wash enough with it on;they may not knew the secondary shield is very effective to prevent a belted woman to masturbate,my mother may have been concerned about periods and chastity belt with secondary shield on...
They may have discovered it does not prevent me to wash or deal with my periods,while preventing me to touch myself when I started to wear it...I haven't asked much about it with them,as I'm not very at ease to discuss my chastity belt with them more than necessarry.
So it can be a totally diffrent reason.And I think they probably wanted to have the more posibilities to cutomize it as they can.
Laura But I'm talking about short shield vs. long.
Short shield in my case,so.