Several countris have 'Romeo & Juliet' consent laws eg there is a sliding scale of age differential. This one for Texas is a good explantion:
www.theshapirolawfirm.com/News-and-Resources/Articles/Romeo-and-Juliet-Law-in-Texas.shtml
I would point out that certain places across the world, the age of consent (under R&J) is often as low as 12
Canada: In June 2006, the Canadian government proposed a bill to raise the age of consent from 14 to 16, while creating a close-in-age exemption for sex between 14-15 year olds and partners less than 5 years older, and keeping an existing close-in-age clause for sex between 12-13 year olds and partners less than 2 years older.[3] The initiative also maintains a temporary exception for already existing marriages of 14 and 15 year olds, but forbids new marriages like these in the future.
Australia:
Tasmania :It is an offence in Tasmania to have sexual intercourse with a person under the age of 17.[22] However, it is a defence if the younger person was aged 12 years or older and the older was not more than 3 years their senior or, if the younger person was of or above 15 years and the older was not more than 5 years their senior.
[23][24]
Victoria
It is an offence in Victoria to sexually penetrate a person under the age of 16.[25] However, it is a defence if the younger party was aged 12 years or older and the offender was not more than 2 years older than the younger person, or they were married
USA
Military exemption Rules for U.S. military
Article 120 of the Uniform Code of Military Justice (10 U.S.C. § 920), to which essentially only members of the United States Armed Services and enemy prisoners of war are subject, defines the age of consent as sixteen years in subsection but allows an exemption for people who are married to minors 12–15 years old.