Mature Metal discussion

We haven’t purchased a device just yet - but we’re making progress!:) I’ve noticed many of you mentioning that you prefer a “snug fit”. What’s the reason behind that? Does it serve any function beyond just how the cage feels against the penis? I was actually considering purchasing a larger cage, one where the cock has some room to expand slightly - I like him getting aroused, but without being able to fiddle with his member so he can climax. Is this feasible? Miss Foxy