Like others have said don't ******* it and don't trick her, that always backfires. Do a date night and just sit and talk if you know a Black man invite him to join you, no strings attached just the three of you talking and interacting. If she is really into this then she will let you know. Another option is go to a swingers club. Just go and see what it is like and see if this is actually what you want. A club is good because you are around others who are into this and there is no pressure.