There is a prevalent theory about fetishes that it is actually linked to obsessive complusive disorder. If someone has a shoe fetish for example and they are being intimate with another person then they won't be able to do so unless they can actually see the object of their obsession. Of course that is evidence that they are not bonding with their partner in a typical way.
It is specifically the fact that it can get out of hand to the point that it can affect someone's work, friendships, and intimate relationships that it by definition has a detrimental effect on that persons bonding with others.