A man, his boyfriend and a third man had an orgy on a late night London Underground train in front of other passengers.
Nicholas Mullan, 24, and George Mason, 35, engaged in an array of sex activities which they filmed on the Northern Line between Leicester Square and Waterloo.
Prosecutors say another man was involved in the astonishing incident, which also involved extensive sexual activity on 19 February last year.
The two men appeared at Westminster Magistrates Court on Friday and pleaded guilty to one count of outraging public decency.
