Police arrested a couple late Friday night who were allegedly naked and performing oral sex behind a stranger's house in East Somerville.

Police were called to 94 Broadway about 10 minutes before midnight for a report of naked individuals in the rear of the house, according to a police report.

At the back of the house, officers encountered a man "in a state of undress" standing in front of a woman who was sitting on the stairs, the police report says.