In Washington, it is illegal for an adult (someone 18 or older) to have sex with a minor (someone younger than 16), even if the sex is consensual.
The state also forbids certain sexual contact and intercourse between minors who are more than a certain number of years apart in age.
Those who break the law have committed statutory rape.
For more information on statutory rape and the history of this crime, see Statutory Rape Statutory rape laws are premised on the assumption that minors are incapable of giving informed consent to sexual activities.
In Washington State, the age of consent for sex is 16 years old.
At this age, a person can consent to sex with any adult, regardless of the age difference between them.
I constantly hoped that it would have been much earlier in my power, consistently with motives which I was not at liberty to disregard, to return to that retirement from which I had been reluctantly drawn.
Friends and Citizens: The period for a new election of a citizen to administer the executive government of the United States being not far distant, and the time actually arrived when your thoughts must be employed in designating the person who is to be clothed with that important trust, it appears to me proper, especially as it may conduce to a more distinct expression of the public voice, that I should now apprise you of the resolution I have formed, to decline being considered among the number of those out of whom a choice is to be made.
I beg you, at the same time, to do me the justice to be assured that this resolution has not been taken without a strict regard to all the considerations appertaining to the relation which binds a dutiful citizen to his country; and that in withdrawing the tender of service, which silence in my situation might imply, I am influenced by no diminution of zeal for your future interest, no deficiency of grateful respect for your past kindness, but am supported by a full conviction that the step is compatible with both.
Though statutory rape does not require that the prosecutor prove an assault, it is still rape.
Of course, rape that does involve force or an assault is illegal in Washington and prosecuted as forcible rape (see Washington Sexual Battery Laws).