From the Jerusalem Post:
Founded by Ayatollah Ruhollah Khomeini in 1979 as a “people’s militia”, the volunteer Basiji force is subordinate to the Iranian Revolutionary Guards and intensely loyal to Khomeini’s successor, Khamenei.
[Members of the Basiji] temporarily marry young girls before they were sentenced to death. In the Islamic Republic it is illegal to execute a young woman, regardless of her crime, if she is a virgin… Therefore a “wedding” ceremony is conducted the night before the execution: The young girl is forced to have sexual intercourse with a prison guard – essentially raped by her “husband”. (source)