What Do You Think Should Be The Best Punishment For "Rapists"?

Rape, according to Wikipedia is a "type of sexual assault usually involving sexual intercourse or other form of sexual penetration carried out against a person without that person's consent" is a common crime in the world we live in today. considering Nigeria as a country where some crimes are placed on a high priority and due to corruption, some people go unpunished and as such the victim may not voice out. If you were in a position to pass judgement to the offender (rapist), what will you do?