A further education college is having to protect builders from wolf-whistling girls, in a reversal of traditional gender stereotypes.
Officials at West Kent College in Tonbridge, Kent, sent an email to all pupils warning that the behaviour was "totally unacceptable", and saying any students caught harassing contractors would face disciplinary action.
The email was sent after a demolition team started work on a £94 million, three-year building project at the campus.
The email read: "It has come to the attention of the college that some female students have been making comments to, or whistling at, the builders both whilst on site and as they walk around the campus.
"Although we are sure no offence is meant, this constitutes harassment and is wholly unacceptable.
"We have asked the contractors' representative to pass on all instances of harassment to the college and we will take appropriate action which may include disciplinary action."
A spokeswoman for the contractors, Galliford Try, said: "We have no registered complaints on this issue. However we do not condone inappropriate behaviour from any parties on our sites."
Meanwhile new laws could see wolf-whistling builders placed on the sex offenders register. The Sexual Offences (Scotland) Bill will create a new offence of "communicating indecently", punishable by up to 10 years in jail.
The legislation is intended to punish sexual harassment by text, emails and letters, but ministers also aim to include sexually explicit comments to strangers. It is expected that the law would only apply to persistent offenders.
At the moment, workmen who repeatedly make obscene comments to passers-by can be convicted of a breach of the peace.