From the New York Times website:
“There were incidents that occurred last year, and in the past, where residents of rooms started to feel uncomfortable with what their roommates were doing in the room,” Carrie Ales-Rich, assistant director for community and judicial affairs in the residential life office [at Tufts University], was quoted as telling the paper. “This happened more often than we’d like.”
And so the office has “added a new stipulation to its guest policy,” according to the paper, “that prohibits any sex act in a dorm room while one’s roommate is present.”