You need the DSM V, the newest edition. In prior editions, psychopathy was not distinguished from sociopathy. I imagine that you could find it by looking through the index, however I do not have a copy of the DSM V.

I'm not sure why you bring up the characterization of homosexuality in older, long-since discarded versions of the DSM. The DSM is merely a reflection of the current state of consensus regarding psychological diagnoses. It's not an authoritative guide. As consensus changes, so does the DSM.