Innocent people confess to rape crimes more often than you think.
Especially those who find themselves having sex with underage individuals. http://womensrights.change.org/blog/view/dna_test...
"DNA tests have exonerated 258 wrongfully convicted persons, many of whom were in jail for rape."
Matt Kelley.
I believe he may have accepted the charge because his girlfriend at the time was 16 and he was 19. He broke the law because he had sex with a minor.