hornylynne: 
Thanks for the idea but steel is no good due to airport travel etc also liked the idea of the PA 5000 due to the fact that it can be locked through his PA piercing
I'll add my two pence worth, although it's late!  My slut's husband wears a stainless steel cage 24/7 except when they go away on holiday, then he has a 'travel' cage, plastic, to stop any unwanted airport alarms going off, As soon as they arrive at their airport destination he is sent to the toilet to replace it with the real thing. That remains for the duration of the holiday. His wife (my slut) has just ordered a PA5000 on the strength of Lynn's recommendation. He doesn't know yet that he's going to be pierced!