> Also, you can't tell just when meeting people whether or not they're in a relationship, so it's a problem regardless.
Well, you can if they're wearing a wedding ring.
Uh, that's not the same thing. Many (the majority?) of twenty something's who are in a relationship are not married.
Is that helpful? Lots of people are not in a relationship. Most of them would like that not to be the case.
Also, you can't tell just when meeting people whether or not they're in a relationship, so it's a problem regardless.