"It is alleged that the man advertised his services through an online babysitting service," police said in a statement at the time.
Harries-Markham was arrested on August 22 at his Bennett Springs home after a police raid.
Police revealed at the time that they seized child exploitation material as well as several gel blasters and "edged weapons".
Harries-Markham is scheduled to face the West Australian Supreme Court on September 27.
Sexual harm - Where to get help
If it's an emergency and you feel that you or someone else is at risk, call 111.
If you've ever experienced sexual assault or abuse and need to talk to someone, contact href='https://safetotalk.nz/' target='_blank'>Safe to Talk confidentially, any time 24/7:
• Call 0800 044 334
• Text 4334
• Email support@safetotalk.nz
• For more info or to web chat visit target='_blank'>safetotalk.nz
Alternatively contact your local police station - href='http://www.police.govt.nz/contact-us/stations' target='_blank'>click here for a list.
If you have been sexually assaulted, remember it's not your fault.