I often bounce the idea of a new person off of my husband first and see how he would feel about me getting romantic with a certain person. This way I hit two birds with one stone, a) he tells me what he thinks of the person in question and gives me an outside prospective and, b) it opens him up to the idea of me getting romantic with someone else. By the time a flirtation leads to a date my hubby is feeling happy and relaxed about it because I keep him in the loop.

You're wife may be open to the idea but the practice is very different. Same thing with the best friend, it may be a good idea to test the waters before you go diving into huge changes. Just keep the communication flowing and be as honest as possible.

Best of luck to you three.