Listen to this man.
Wearing a cage keeps me sexually aroused for the whole session, however long it may be, regardless of the fact that you can't get an erection.
I used to find I would either wank myself off too early and after a while start thinking about when they would be finished, or would want to get more involved than perhaps my wife and her lover would really prefer.
Also my wife prefers not to let me out for a while after, she has told me that after a session she doesn't really need another cock inside her until she is ready for one.