i think i can help you with this, cuz i've been cuckolded by my wife for four years now, it started after few times of disappointing intercourse with her which didn't last to a minute then she started using her own vibrator while watching porn of guys with big cocks, and yet once she woke me u telling me that she doesn't want to have sex with me again cause i am not man enough to satisfy her needs and she wants to lock my penis in a penis cage because it is already useless, at first i declined because i thought it was humiliating but after that she challenged me to have sex with her and last longer than anytime before, of course i failed, so i somehow felt that i deserve the chastity device, after that she started having random men to have sex with her and she told me she wants me to sit in a corner and watch how a real man can have his way with her, day after day she developed it to having sex with black men only because of their huge cocks, i guess that's it.