Does the bible really say a man and woman can't live together if not married?

I want to get a female roommate in college and i was curious. Not that it matters to me, I'm an Atheist. My parents are insanely religious and keep telling me it's "sinful", which again I don't care because I don't rely on them for any support but I want to know where the bible says that living together would be "sinful". It's not about a sexual thing, it really boils down to is it's a great deal in a great room close to campus. Either way, im too lazy to crack open the bible myself so I figured if it existed, someone would know. Thanks