Early morning commuters on Berlin's underground got a rude awakening when they saw a couple having sex in a deserted train station.
One quick-thinking passenger grabbed his mobile phone and filmed the randy duo's early hour romp, which has become a hit online.
When the man spotted the train and realised the pair were being filmed, he raised his middle finger at the cameraman, while continuing his sex act in full flow.
Footage from the Schoenleinstrasse underground station shows the woman leaning against the wall with her skirt raised.
Clothing choices suggest that the eager pair had attended a social event earlier that night, with the man donning a tuxedo and woman a smart dress.
German police have said that they will not be investigating the incident as nobody made a complaint.
Transport officials refused to comment.
Media parties in Germany are searching for the couple and have offered a reward for the identity of the pair.
The video has notched up over 182,000 views since it was posted
