Nonverbal but unequivocal in a relationship

I had an idea for something that seems like it would be fun in a marriage or other relationship where at least one partner likes the other to take control without asking sometimes. Get a piece of jewelry that can go with almost anything, like maybe a pin, and make a verbal agreement that you'll wear it only when you want your partner to initiate or take control or take you or use you or whatever variation floats your boat. Seems like a nice compromise between the need for communication and the need for silent acquiescence that some people feel.