There has to be a distinction between reality and fantasy. What one fantasises about wouldn't always work in practice.
So take the threesome idea. All very nice in fantasy. But when one girl is your wife, and the other a stripper!? So how is your wife going to feel if you give too much attention to the stripper? And that's only a question for starters. Once you've set a precedent, how does sex compare afterwards without the stripper? Does this mean that threesomes are something one will do regularly?
Frankly, I think this is just too whacky. If the threesome was with two fictional/fantasy girls, who you don't know, and there are no feelings to be hurt, then that would be one thing (better make sure both are strippers). But mixing reality with fantasy, having a threesome with your wife, I think that is frankly crazy, and could lead to a lot of hurt feelings.