The "public location" explanation is the only thing I can think of that would make any sense at all. But still, locked door. I don't know a single specific thing about Scottish law, so can't speak to details. Though the fact that he apparently pled guilty doesn't bode well.

Bike Sex Man and Gay Sex Man - superheros defending pansexual causes across the world!

BBC has bizarre headline conventions. The guy who got in trouble for a racy editorial cartoon about the Spanish monarchy was referred to as the "royal sex cartoonist".