Is it permissible for a wife to adorn herself and appear in full finery before her mother's foster uncle? And what is the punishment for a wife being approached anally?

The maternal uncle of the mother is a mahram (unmarriageable kin) to the woman. A maternal uncle through suckling is like a maternal uncle by blood. Therefore, it is permissible for the wife to appear before her mother's maternal uncle with her usual adornments, provided there is no fear of fitna (temptation). As for anal intercourse with a woman, it is forbidden and a major sin, and its perpetrator is cursed. It also has negative effects on the spouses and on sound human nature.