避孕 Griswold v. Connecticut was a landmark 1965 case which ruled the use of contraception between two married individuals was a matter of privacy and constitutionally protected.
同婚 Lawrence v. Texas in 2003 dealt with homosexual sex between consenting parties, and Obergefell v. Hodges treaded the same territory in 2015 to rule gay marriage as a constitutionally protected right to privacy.