Kiparsky: compounds can be formed out of irregular plurals but not out of regular plurals. For example, a house infested with mice can be described as mice-infested, but it sounds awkward to describe a house infested with rats as rats-infested. We say that it is rat-infested, even though by definition one rat does not make an infestation. Similarly, there has been much talk about men-bashing but no talk about gays-bashing (only gay-bashing), and there are teethmarks, but no clawsmarks.
