>>No. Otherwise hetero sexuality is an action, a verb. They are nouns.
Yeah, well what about this line from the cited article: "even among men preparing for the priesthood, an ambiguity both about the Church's teaching with regard to homosexuality and even whether some homosexual activity could be compatible with celibacy" [emphasis added]
So, "some homosexual activity could be compatible with celibacy", makes no sense. Activity is the verb here. Homosexual is an adverb describing the activity. It says in general essence, "some sex may be compatible with no sex."