Pawel Relowicz's victims were left "violated" by his actions as prosecutors described how the Polish national, who has been living in Hull for seven years, acted in an "odd and worrying" manner when he committed offences of voyeurism, burglary and outraging public decency over a 19-month period.
Judge Jeremy Richardson QC was told the defendant's bizarre acts included pleasuring himself in public, spying on women in compromising positions and stealing sexual items from properties.
Relowicz, 25, of Raglan Street, Hull, was due to go on trial at Sheffield Crown Court on Monday, but instead admitted four counts of voyeurism, two of outraging public decency and three of burglary.
He had also been charged with two further counts of burglary, one of outraging public decency and one of handling stolen goods, but these will lie on file.
Judge Richardson described Relowicz as a "very dangerous individual" and "a sexual predator".
The voyeurism charges relate to four instances when Relowicz was caught watching women between June 2017 and December 2018.
One of the victims had moved into a new home on the day she was watched, and was engaged in an "intimate act" with her boyfriend when she saw the father-of-two spying on them them through an open window.In a victim impact statement read out in court, the woman said: "It is something that I still think about to this day, and it weighs heavily on my mind."
Relowicz spied on a different woman after she had got out of the shower on February 16 last year. He had apparently planned the offence after noticing the victim's blinds did not fit properly.
In the early hours of May 6 last year he came "within inches" of the window of a woman's bedroom when she was wearing only a sports bra and pyjama bottoms, and on Boxing Day he watched another woman dancing in her lounge wearing only leggings and a bra.
The same woman also reported seeing Relowicz's hands coming through her letterbox less than a month later.
Among the burglary offences, he stole sex toys from a property in Hull on December 8 2017.
Richard Woolfall, prosecuting, said it was "worthy of note" that, despite stealing the sexual items, Relowicz did not take a high-value laptop on the victim's desk.
Relowicz also admitted stealing £148 in cash from the home of a mother-of-two, who found an unwrapped condom in her living room by a child's toy, "together with a pair of knickers that must have been removed from a washing basket that had been in the kitchen", Mr Woolfall said.
The prosecutor said the items had been left in the home as "a calling card".
On another occasion, he stole photographs, condoms, a laptop, an e-reader and a speaker from a Hull property, the court was told.
On two occasions in January this year women saw him committing a sexual act in the street, with one saying he "didn't seem bothered" to have been spotted, prosecutors said.
Dale Brook, defending, said that a spell in custody would be made "all the worse" by the fact that Relowicz has two young children, aged nine months and three years.