the opposite of "anal" is "anal"

Impeccably argued, sirrah

Mind you, given that the extra word is dropped for anally-retentive, perhaps it should be added in the opposite case, thus:
anally-expulsive-expulsive

But if you expel the expulsive, you are left only with the retentive, thus:
anally-retentive

Hmmm.
Talk about vanishing up your own <ahem!>.