Does uttering "you are divorced by 18" in jest constitute a divorce, and is the wife considered to have been consummated after engaging in an indecent act with her anally, and how can she be taken back?

If you utter the words of divorce unintentionally or in a state of astonishment, it does not take effect. However, if you intend the explicit wording, the divorce takes effect whether you are serious or joking. If the divorce occurs before consummation but after a valid privacy, the fatwa we hold is that valid privacy is considered equivalent to consummation, and the husband retains the right to take her back without the need for a new contract.