I agree. I had a girlfriend some years ago that did that to me. In the start I was suspicious, but in the end I really liked it.You might be pleasantly surprised. Not all chastity play has to involve the man being turned into a sissy or being feminised in any way. It can be done to enhance teasing and denying them until you are ready to unlock them.
Personally I lock myself away as I enjoy the feeling of being teased and aroused while caged and I find it enjoyable even when I'm Domming someone.