It's rude not to introduce your parents to your partner.
Sean, who lives with his parents, has a new girlfriend and brings her home for a relaxing night.
Sean wants to go to his part of the house.
Sean enters the house and introduces his girlfriend to his parents, then goes to his room.
Sean says a quick hello to his parents and leads his girlfriend past them to go to his room.
Sean's parents have a good first impression of his girlfriend and support the relationship.
Sean's parents think that the girlfriend is just a fling and treat her fairly rudely.