i personnaly am against it !
but i knew a couple in France, who do it and they have 3 children and are incredibly happy together !!
when u think about it, it does solve alot of the problems a couple can face !! there will not be anymore cheating, an atmosphere of peace would dominate the relationship since the se(x) factor and tention is resolved !!
some psychiatrists think it is also related to many factors, such as hidden homosexual attraction, need of contunious affection or continuous search of pleasure ! some also say it is a reflection of the continous need to feel attractive and able to please others !! lots more !! google it !
i personally would knock the teeth of a guy simply looking at my wife !! but thats me !