Clerics run officially sanctioned internet dating agencies with strict rules.[137] Prospective couples can have three meetings: two with strict supervision inside the center, and the third being a "brief encounter on their own"; afterwards, they can either (1) choose to marry or (2) agree to never see each other again.[137] This has become the subject of a film by Iranian filmmaker Leila Lak.[1] Iran has a large population of young people with sixty percent of the 70-million population being under the age of thirty.[138] However, economic hardship discourages marriage, and divorce rates have increased in Tehran to around a quarter of marriages,[138] even though divorce is taboo.[138] While the Iranian government "condemns dating and relationships", it promotes marriage with (1) online courses (2) "courtship classes" where students can "earn a diploma" after sitting through weekly tests and "hundreds of hours of education" (3) "marriage diplomas" (4) matchmaking and arranged marriages.[138] Authorities push a conservative approach and shun unmarried romantic relationships and encourage "traditional match-making".[138] But young people have disobeyed the restrictions; one said "It is wiser to have different relationships" and believed in defying religious rules which suggest "short-term illegitimate relationships harm dignity."[138] Adultery can be punished by death.[138] While youths can flout selected restrictions, there are almost no instances in which unmarried people move in together.[138] There have been efforts to promote Sigheh (temporary marriage).[2]