Another of Cameron's conclusions, based partly on his studies of obituaries in gay newspapers, is that homosexuals as a group have a median age of death about 20 years lower than that of heterosexuals. After analyzing official data from Denmark, which allowed same-sex unions in 1989, and Norway, which allowed same-sex marriage in 2009, Cameron reported in 2007 that "married lesbians lived to age 56 and married gay men to age 52." Cameron states that many victims of child sexual abuse are the same sex as their abusers – one FRI study on sexual abuse by foster parents in Illinois reported that 34% of perpetrators were guilty of same-sex abuse – and concludes that "there is a strong, disproportionate association between child molestation and homosexuality."