And by the way here is my stance. I like to admit that i might BE generalizing the desi or any other guys dislike the idea of threesome (ffm). True!. However, i would like to clarify that your fiance/boyfriend might not want to admit it this fantasy of ffm because they know..this will hurt you. Again i am only saying. Yes we can be sensitive to your feelings like that because we love and respect our wives. Again, there is always gray area.
Also, i completely agree that this idea of ffm is infact dis-respectful to your wife. There is no if or buts about it.