My Wife doesn't care for anything that might compromise my ability to become erect when she wishes or effect my performance in any way, so we don't use any device.
This doesn't mean I can have orgasms whenever I wish, however. I still need to ask her permission if it is in between the times she permits it of her own desire.
No, I couldn't get away with sneaking one as she would know as I do have a mood swing which she is keenly aware of.