Perhaps you should back up and start slower, while having sex with her and she is very hot maybe suggest some swinging ideas like playing with another couple or her with another woman or maybe going to a club where you can watch or play as she desires, bring her into the lifestyle slowly and if she gets a taste she may just want a little more, move slowly from couples to maybe some small group play or a 3 some MFM or fmf and let her learn to enjoy sex with others, in time you can work up to some black men joining you and in time just sit back and watch her play and who knows maybe before long she will be wanting that black cock all the time and you will be there watching and cleaning up when they are finished, I think you need to back up and slow down a little if you truly want it to happen. I know bringing my wife around was a long process but today she is a bbc only girl, with the exception of me. LOL