2 ?'s: 1.) In your opinion, why do people hold hands in public? 2.) Why *do*...

...people perform PDA's? 1.) Is it just another one of those "public displays of action" kind of thing? Is it to signify that the two are "taken?" Is it a way of "showing off" their relationship to other people? Or something else?

2.) Why *do* people perform Public Displays of Action?