Vanessa The secondary shield’s main purpose is to prevent the wearer to masturbate;if the purpose of the chastity belt is only to stay virgin,or if she never masturbante(I doubt it is frequent),it is not needed.
I think my father wouldn't even think about the idea of me not wearing the second shield. I think for him it's 90% taking away my ability to pleasure myself.
Otherwise the pill or condoms would be an option. Virginity is not a big value in our family, it just the logical consequence of being belted.