Just that really, with so many younger adults in their 20's or even older living in the family home, it makes it harder to start a relationship surely? Can you take them back to your house after a meal out on a first date. Probably not? How about the first time you have sex, can you do that where you live or do you have to book a hotel? Even if your parents are away, does having sex in someone childhood bedroom give you the ick?
I get there are economic advantages f living at home but does anyone see the disadvantages form a dating perspective.