A woman had sex with FIVE schoolboys - in full view of passing trains.
Outraged passengers phoned police who arrested Samantha Armstrong, 21, at the scene.
Three of the boys - said to be around 15 or 16 - were questioned but the two others fled.
Dope smoker Armstrong had approached them in the street and asked: "Do you want to have sex with me?"
The gleeful lads followed her to the back of a building close to a railway line at Abbey Wood, South London. She then had sex with each of them.
Armstrong, of Gravesend, Kent, nervously giggled in the dock at Greenwich Magistrates' Court, South East London, as she admitted outraging public decency and possessing cannabis resin.
A psychologist said Armstrong had "difficulties appreciating what is appropriate behaviour" but was not mentally ill. Her lawyer Tatinder Sohkal said: "She lacks self-confidence and self-esteem."
District Judge Angus Hamilton adjourned sentencing until May 16 and said he was only looking at a community penalty. A source said after the case: "To the boys it was like all their Christmases and Easter had come at once - but their parents will probably be furious. Apparently Armstrong went at it like an express train going through one after another.
"She didn't realise they could be seen."
