Can a husband and his wife give oral sex to each other? Should a wife obey her husband if he asks her to do so? Is anal sex disliked?

In Islam, the marital relationship between spouses is based on permissibility which is controlled by chastity and piety. Based on this, all forms of sexual pleasure are permissible provided there is mutual agreement between the spouses and there is nothing brings harm to either of them, except for anal sex and intercourse during menses and post natal bleeding.