My boyfriend and I can't find a place to have sex, what do we do?

We've been together for a long time, we're 19. We both live with our parents, they're always home. It's freezing outside. Basically, we have no place to... do more. What's the solution? I've been told to go to a hotel, but I'd simpy hate that.
My boyfriend and I can't find a place to have sex, what do we do?
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