I want to see my wife of 30 years take a BBC. She has never had anyone but me as a sex partner so when I breach the subject she tell me she only needs me. How do I convince her to take a black man to bed?
Its obvious: you need to convince her thoroughly your reason for wanting her to make this choice. However , pay special care to the words you use. Do not make it sound like its something you want just for her, rather as something that will involve the both of you. Be plain, honest and open, and keep on complimenting her beauty.
But most importantly, you'll have to define the cuckold realtionship for how as well as for yourself.