A man has pleaded guilty to indecently assaulting a string of young men police believe were preyed on after nights out in Claremont, Nedlands, and the Perth CBD.

Brendon Quintin Webb, 41, this morning pleaded guilty to 17 separate indecent assaults on victims — many of them unidentified — in a disturbing catalogue of crimes dating back to mid-2017.

The horrifying predator came to light earlier this year, after a 19-year-old told WA police he woke up being abused in a stranger’s car in Doubleview in January.

The teenager allegedly told police it was several hours after he had left The Avenue at Club Bayview at 1am when he woke, with his attacker telling him he was just trying to get him home.

In fact, he had indecently assaulted him — a fact Webb admitted to first, during an appearance on video link at Perth Magistrates Court this morning.

The police investigation identified Webb’s white car on CCTV at Doubleview on the night of the attack — one of four locations where he allegedly drove the teenager. Inquiries then matched the GPS locations on the 19-year-old’s phone, with the car’s registration plates leading police to Webb’s Armadale home.

Detectives then revealed their raid uncovered up to 20 videos, and several photos of other alleged victims, all believed to be men in their late teens to early 30s.

They revealed they suspected at least 20 young men may have been drugged, abducted and assaulted by the predator.

Today, Webb admitted to 17 separate charges of indecent assault, and one of drug possession.

Only four of the victims were identified on the prosecution indictment, with the rest catalogued as unidentified adult males.

The attacks occurred in January and February this year, November, October, May March and January last year, and September, August and July 2017.

Even when revealing the scale of the attacks, WA Police inspector Louise Ball said they were unsure exactly how many victims there were.

“What I think has taken place is someone who is opportunistic has preyed on young, vulnerable men — who have obviously been socialising with friends, out and about, they’re in the entertainment precinct trying to get from A to B — and seen the opportunity to offer them a lift while they’re in that vulnerable state,” she said.

“It would appear that our accused is targeting young vulnerable men between the ages of 18 and 35.

“As we can imagine there’s a degree of perhaps embarrassment or awkwardness to that, and that’s why we stress if you think that you are a victim please come forward, ring Crime Stoppers, we’ll treat your information with discretion and confidentially.”

Webb was remanded in custody ahead of a sentencing hearing next month.