-Your boyfriend/girlfriend still lives with his/her parents.
-You and his/her parents get along great; they like you, you like them.
-Your boyfriend/girlfriend wants to sleep together every night, but since (s)he never suggests sleeping at your apartment (you live with roommates, not your parents), you interpret this as him/her preferring to sleep at his/her place.
What do you think of sleeping (often) at a significant other's place when he/she lives with their parents? Would you think it's rude to stay there all the time, even if they don't seem to mind your presence at all?