Answer
It will not be permissible for men to have vasectomy. A vasectomy is tantamount to permanent birth control which is not permissible. Moreover, it is also tantamount to ?change in the creation? which is prohibited in the Qur’aan. ?And I (Shaytaan) will order them to deface the nature created by Allah.? (Contemporary Medical Issues in Islamic Jurisprudence pgs.185-186)
The ruling of wearing the trousers above the ankles is Waajib (compulsory). It comes in a Hdith that whatever is below the ankles will be in the fire of hell.
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai