To be the pedant, you're not quite correct on the statutory rape in English law.
That applies to sex with children under 13.
Where the sexual contact was 'consensual', in so far as a young teenager (13 -15) can give consent, it is considered sexual activity with a child, and punished less severely.
While I mostly agree with gayinpattaya, I think there is a big distinctions to make between 16+, 18+, and 21+.