1) Legal threshold 
(from the article `family law`) In order to satisfy the requirement of a voluntary consent to a marriage, a party must have reached an age at which he or she is able to give ... ...effective consent to sexual intercourse is commonly set in most countries at between 14 and 18 years (though it is as low as 12 years in some ... ...theat...
age at which a person can legally agree to sex
See: legal age, age of majority
Age of consent is a term for an age that depends upon the legal circumstances to which it refers. For commercial purposes, it is set at 18 years by the Family Law Reform Act (1969). A contract signed by a minor (i.e. someone below the
[n] - the minimum age for marrying without parental consent or the minimum age for consensual sexual relations
noun the minimum age for marrying without parental consent or the minimum age for consensual sexual relations; intercourse at an earlier age can result in a charge of assault or statutory rape; the age differs in different states of the Union
the age at which a person becomes legally competent to consent to marriage or sexual intercourse.