An airline pilot hid a camera in a woman's bedroom without her knowledge.
Martyn Bourner, of Orchard Road in Port Erin, appeared before Deputy High Bailiff Rachael Braidwood at Douglas Courthouse.
The 34-year-old admitted trespass with intent to install a surveillance device in Port St Mary.
Recovered footage showed Bourner entering the bedroom and going through underwear and belongings before committing a sex act on her bed - other footage showed the woman and others.
The case was committed to the Court of General Gaol Delivery for sentencing, and he was bailed on condition he doesn't contact his victim to appear in court again on May 24.
Tin bath races mean bus diversions tomorrow
MHK wants backing for changes to Tynwald members' pay
Storage firm announces closure
Mountain Road shut for skate setup later
Bus diversions for tin bath day tomorrow
MP criticises Island's fishing visa rules in Westminster
Post Office won't release Evri documents as courier prepares to leave Island
Strix to shut Ramsey factory