I don't know, I'd never outright tell my husband he couldn't do something that he wanted to.
Who am I to tell him what he can and can't do? I would be LIVID if he came up to me and forbade me from doing something. There's no way in hell that would fly with me!
If I was upset or against something, of course I would say so. I'd state my reasons. One of the great things about my guy is that he understands and listens... so if I was seriously opposed to something he probably wouldn't do it. Just as I wouldn't do something that he was seriously opposed to.
I guess I just don't understand the 'Oh, I'd tell him no and he better respect it' mentality. Honestly, if he ever tried that on me my first thought would be how DARE he!