The Church has been criticized for its opposition to promoting the use of condoms as a strategy to prevent the spread of HIV/AIDS, teen pregnancy, and STDs. The Catholic Church teaches that all Catholics must practice chastity according to their states of life, and Catholics with homosexual tendencies must practice chastity in the understanding that homosexual acts are "intrinsically disordered" and "contrary to the natural law." The Vatican has reiterated the standing instruction against ordaining gay candidates for the priesthood.