Does the ruling on sodomy apply to a person who expresses to his fiancée his desire to be anally penetrated by her before marriage, because this causes him pleasure?

The question is unclear. However, if the intent is that the husband loves for his wife to insert something into his anus for his pleasure, then this is impermissible. Rather, it is a form of perversion and a perversion of natural inclination. However, it is not considered sodomy (liwat) in the legal sense, which the Lawgiver has prescribed death for, and which involves the disappearance of the glans into the anus of a male. The perpetrator of this act should be advised of its impermissibility. If he insists, he should not be married to, due to his unsatisfactory religious commitment and character, as the Prophet, peace and blessings be upon him, said: "If someone whose religion and character you are pleased with proposes to you, then marry him. If you do not do so, there will be tribulation on earth and widespread corruption."