Forty-three yea old man, Garth Michael Williams pleaded guilty to being penetrated by a living animal in Newry Crown Court .
He admitted two counts of allowing himself to be penetrated by a living animal on a date unknown between 1 February 2009 and 4 April last year, saying simply "guilty" in a quiet voice.
Williams, a civil engineer originally from South Africa but who was living in Co Down at the time of the offences, also pleaded guilty to 10 charges of distributing indecent images of children.
He also admitted 17 counts of possessing or making indecent images of children and two further charges of possessing extreme pornography.
The indecent images charges all date back to between 10 October 2011 and 4 April 2014.
Following the guilty pleas, Williams was remanded back into custody and will be sentenced at the end of May when probation and other reports will have been filed.
Adjourned passing sentence, Judge Kevin Finnegan QC advised Williams to "be frank" with those tasked with compiling the reports.