Everyone who has ever been in a relationship knows there are certain things you don't do in front of your significant other right off the bat — like peeing in front of them, plucking their nose hairs, or using their hygiene products. You need time to build up to those kinds of activities.
BuzzFeed put together an adorable video that shows 16 milestones couples reach as they get more and more comfortable with one another. You know you're in a serious relationship when your significant other's mom calls you directly, just to chat.
(H/T: Huffington Post)