Does a wife observe a waiting period (iddah) if her husband had anal intercourse with her after marriage, then divorced her before having vaginal intercourse with her, and is this considered a consummation of the marriage?

It is forbidden to have anal intercourse with one's wife, and this entails legal consequences such as the obligation of ghusl (ritual bath), mahr (dowry), the prohibition of marriage relations (through affinity), and the obligation of iddah (waiting period) upon the woman. It also invalidates acts of worship and necessitates expiation, and this is by the consensus of the majority of scholars.