Judging from Google, not only Werner Siebers is baffled by a Telegraph report:
Die spinnen, die Engländer. Weil ein Mann Sex mit seinem Fahrrad hatte – wie auch immer das befriedigen kann – muss er sich jetzt vor Gericht verantworten. 1993 musste in England bereits ein Mann einsitzen, weil er sich mit Pflastersteinen – auch das übersteigt meine Phantasie – vergnügt hatte.
(‘Die Engländer’ here means the British.) Even I find this odd. Let’s forget about the 1993 Redditch case of a fairly naked man in contortions on the pavement and look at this Scottish case – and note that it is a case of Scottish criminal law. It seems odd to me – and others discussing it inter alia on snopes.com – not only that it was an offence although he was in his own room and the door was locked, but also that he should now be registered as a sex offender. The man admitted to a ‘sexual breach of the peace’.
Collins Dictionary of Law (cheap paperback, ISBN 0007102941) is good on Scots matters:
breach of the peace in England, conduct causing harm or likely to cause harm or generally disturb the peace. The preservation of the peace is an ancient Crown prerogative. it is an especially important offence in relation to civil liberties, for if conduct is likely to occasion a breach of the peace that will justify arrest.
In Scots criminal law, disorderly conduct that is likely to occasion a public disturbance. It is a very widely construed crime and often causes concern in relation to civil liberties. It encompasses looking in at a lighted window … statements made to another in the absence of witness in private … and even an exuberant blow to the chest of a fellow footballer.
Consider also the case of the Englishman from Bournemouth jailed for hiking naked – but only once he reached Scotland.