What are the ways to be cured of thoughts of adultery and immorality in an environment where such transgressions are prevalent, and is it permissible to marry, or to use masturbation, or a temporary marriage (Misyar marriage) for this purpose, given that the period of study is two years and the person is not married?

Adultery is a grave sin and a cause of evil. One must not even contemplate it, and a Muslim should قطع (cut off) their satanic whisperings. Marriage is the best protection for a Muslim against tribulations, as the Prophet, peace and blessings be upon him, guided: "O young people, whoever among you can afford to marry, let him do so, for it helps him lower his gaze and guard his chastity. And whoever cannot afford it, let him fast, for it will be a shield for him." There is no objection to a Misyar marriage if it fulfills the correct conditions, and it must not be for a specified period. If marriage is not possible, you should fast and avoid anything that incites desire. If you fear temptation, then migration to a Muslim country becomes obligatory.