MEDFORD, Mass. (AP) — Sex in a Tufts University dorm is fine. Sex in a Tufts dorm with your roommate present? That’s a no-no.This semester, the school has a new policy banning sexual activity while a roommate is in the same room. A Tufts spokeswoman said the school issued the new rule after a dozen or so complaints in the past three years. The school maintains the new policy is about respect and consideration, not about regulating students’ behavior. Officials hope the policy will get roommates talking about the issue of space with each other.