Ireland's 2006 law has been contested because it treats girls differently from boys.
Gratian, a canon lawyer in the 12th century, stated that consent could not take place before 7 years of age.
Romeo and Juliet laws were passed in 2007 in Connecticut and Indiana. Limon case, Kansas's Romeo and Juliet law was found to be unconstitutional because it excluded same-sex sexual conduct.
Some countries other than the United States also have Romeo and Juliet laws.
In the late-19th century, a "social purity movement" composed of Christian feminist reform groups began advocating a raise in the age of consent to 16, with the goal of raising it ultimately to 18, and by 1920 almost all states had raised their age of consent to 16 or 18.
By the mid-1970s, there was widespread sympathy among homosexual activist groups for lowering the age of consent for all sexual activities (partially due to the disparate ages of consent for same-sex and opposite-sex sexual activity), These tensions and antagonisms continued among activist circles until the 1980s; however, since the 1970s, gay liberationist groups promoting frontline advocacy against the age of consent were falling into decline.