Consenual vs non-consensual. Minors cannot give consent. But you knew that.
Why? Because the legislature says so? BWAHAHAHAAAA
.
Then why are some states age of consent laws under 18? On top of that, why do some states have a "Romeo & Juliet" clause that permits adult/minor and minor/minor relationships as long as the 2 partners are within 4 years of each other?
Age of consent laws are not consistent in this country (seems to be a state right to determine this, how arbitrary and "moral").