Civil solidarity pacts (PACS for ), a form of registered domestic partnerships, were enacted in 1999 for both same-sex and unmarried opposite-sex couples by the Government of Lionel Jospin. Couples who enter into a PACS contract are afforded most of the legal protections, rights, and responsibilities of marriage. The right to adoption and artificial insemination are, however, denied to PACS partners (and are largely restricted to married couples). Unlike married couples, they were originally not allowed to file joint tax returns until after 3 years, though this was changed in 2005.