 Twelver Shia as the main branch of Shia Islam permit "Nikah mut‘ah"—fixed-term temporary marriage—which is not acceptable within the Sunni community, the Ismaili Shia or the Zaidi Shia and is believed a planned and agreed fornication.Twelvers believe that Mutah was permitted until Umar forbade it during his rule.Mutah is not the same as "Misyar" marriage or " 'Arfi" marriage, which has no date of expiration and is permitted by some Sunnis.