23-year-old Sagan couldn't win, but climbed the podium together with Cancellara and Belgium's Jurgen Roelandts who took third place.
The Sagan manoeuvre was not seen by the cameras as the show was still going live, but photographers did capture the moment.
Sagan might have meant it as a joke, but had also triggered controversy as his inappropriate move was spread through different media on Easter Monday. Peter Sagan, the rising star in cycling, eventually apologised. It was only a joke, he argued. It was not my intention to disrespect women. Sorry if someone was disturbed about it, he tweeted.