Can you live with someone of the opposite gender and not be in a romantic relationship with them?

Can you live with someone of the opposite gender and not be in a romantic relationship with them?

Excluding relatives of course.

My wife and I know a couple of aquaintances that live together but categorically deny being in a relationship. They just live together as roommates.

I believe them, my wife instead says she believes they must have something going on, even if it's just a friend-with-benefits situation, and they do act like a couple sometimes.

Can you live with someone of the opposite gender and not be in a romantic relationship with them?
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