"Guys who enjoy cruising in their underwear can join the party at 6 pm and get involved in the action that will still be going strong" SBN and NBN (standing for “Stark Bollock Naked” and “Near Bollock Naked”) are some of London’s largest and most popular naked parties, taking place every Sunday at UNION in Vauxhall. Join SBN during the day (2 PM - 10 PM) for over 400 fully naked guys enjoying DJs and a massive play area with equipment, or choose NBN (6 PM - 10 PM) for a shorts-and-underwear-welcome party in a large private garden. Entry is £15 and includes coat check and a drink.