Boy blackmailing me with putting inappropriate photos on facebook?

Whilst being intimate with the boy I like at a party ( who turned up to be a complete idiot) all his friends ran into the run and ripped the covers off and took photos and videos. They now keep threating to put these on facebook just for fun unless I send them more photos. I know that its possible to report photos that show nudity although most people would have seen them by the time anything happens and the damage will be done. Also some of the photos don't show private parts but it is obvious what is going on. Please help, I have a good reputation and this is making me extremely depressed.