I'm glad you have seen things that way Starburst. If your husband really loves you, why would he want you to suffer more than you can handle? It makes no sense to me. I'd be worried about someone willing to do that to a complete stranger, never mind the one person most willing to trust them.
Btw, how would he feel about you tying him up, and pushing progressively larger things into his urethra (or ass) without a safeword, so he could explore the limits of his endurance?