In most states they still start in juvenile court and are transferred to adult court. I don't know what the law says in Iowa it is unclear if they are generally moved or start in adult court by the quote.
http://www.nolo.com/legal-encyclopedia/juveniles-youth-adult-criminal-court-32226.html
Per Iowa Code section 232.8, subsection 1, pertaining to jurisdiction of the juvenile court:
c. Violations by a child,
aged sixteen or older, which
subject the child to the provisions of section 124.401, subsection 1,
paragraph
"e" or
"f", or violations of section 723A.2 which
involve a violation of chapter 724, or violation of chapter 724 which
constitutes a felony, or
violations which constitute a forcible
felony are excluded from the jurisdiction of the juvenile court and
shall be prosecuted as otherwise provided by law unless the court
transfers jurisdiction of the child to the juvenile court upon motion
and for good cause. A child over whom jurisdiction has not been
transferred to the juvenile court, and who is convicted of a
violation excluded from the jurisdiction of the juvenile court under
this paragraph, shall be sentenced pursuant to section 124.401B,
902.9, or 903.1.
Sexual abuse is a forcible felony per Iowa Code section 702.11, subsection 1.
1. A
"forcible felony" is any felonious child endangerment,
assault, murder,
sexual abuse, kidnapping, robbery, arson in the
first degree, or burglary in the first degree..