Religiously, whether you can have sex after a divorce depends on the specific religion. In Islam, intercourse with a spouse after divorce is only permitted during the iddah (waiting period), and requires a new marriage contract after the iddah expires. In Christianity, sex is generally restricted to within a valid marriage, so sex after a divorce is considered adultery unless a remarriage occurs under permissible grounds, such as the innocent party after adultery or if an unbelieving spouse leaves a believer. In Judaism, having sex after a religious divorce (a Get) is considered adultery, and the couple would need to go through the entire divorce process again if they wished to marry, according to a Reddit post.