After "Lawrence v. Texas", the U.S. Supreme Court decision finding anti-sodomy unconstitutional, Cornyn condemned the "startling display of judicial activism that so threatens our fundamental institutions and our values". He said he worried that the Supreme Court would next overturn the Defense of Marriage Act, which prohibited recognition of same-sex marriage at the federal level, and subsequently played a leading role in trying to introduce a constitutional amendment to prohibit same-sex marriage. Cornyn argued that recognition of same-sex marriage harmed those who were in heterosexual marriages. He claimed that children raised by gay couples are "at higher risk of a host of social ills", such as crime, drug use and dropping out of school, arguing that same-sex would put "more and more children at risk through a radical social experiment". Cornyn opposed adoption of children by gay couples.