First of all not all zombies are male -let's be clear-. Secondly, zombies are loners, we dislike company. If at any given moment in time we decide to start a relationship, both parts know that is not going to be for a long run, mostly because one or the other will deteriorate faster than the better half.
Having that in mind, we get separation anxiety. To prevent us for getting the blues, we go to the taxidermist, who for a small amount of money can stuff the wife's head (funny enough wives have the tendency to just move on) and we display them in our living rooms. Is a nice way to remember and...to decorate!