You can do it in public, but not in private?

Britain continues to confuse me. Four men who had an orgy in a public park received formal apologies because fire fighters stared at them. On the other hand, a man getting it on with bicycle (yes, that’s not a typo) was arrested and placed on a sex offenders list. If you can draw a logic chain between the two, I’ll be impressed. All I can think is that gays are a protected class in England, while bicycles are not.