We are not amused:

Had she known, Windsor Castle’s most famous resident would not have been amused.

A couple were caught having sex on a grass bank outside the Queen’s residence yesterday – as hundreds of shocked tourists looked on in horror and amusement.

Apparently unable to control themselves, the drunken pair stripped naked and began having sex in front of the Castle’s Garter Tower in full view of a busy road and shops.

Amused Japanese tourists jostled for position as they filmed the couple.