Tbf, while it is state law and so varies, many US states have a provision something like “if over 18, can’t fuck under 18yo, UNLESS you’re within 4yr and have met in an organic way, like school or work.” So an 18yo and a 17yo from the same school would be fine, but a 21yo who met her online or at the mall would still get in trouble for the 17yo, if the parents press charges.
Tbf, while it is state law and so varies, many US states have a provision something like “if over 18, can’t fuck under 18yo, UNLESS you’re within 4yr and have met in an organic way, like school or work.” So an 18yo and a 17yo from the same school would be fine, but a 21yo who met her online or at the mall would still get in trouble for the 17yo, if the parents press charges.