Internal documents suggest that a University of Iowa athletics official who resigned this week was accused of trading football tickets and money for sexual favors and inappropriately touching students.

The Iowa City Press-Citizen obtained documents from an internal investigation by the university's human resources and employment offices.

The investigation determined that former senior academics adviser Peter Gray had a history of inappropriate behavior during two stints at the athletics department. The documents allege that Gray made sexual comments during a presentation to recruits and their parents and touched a student's genitals.

One student told investigators Gray exchanged money and football tickets for sex with someone unaffiliated with the university. The documents were posted on the newspaper's Web site Friday night.

Athletics Department spokesman Steve Roe declined to comment.