In general, people should be aware of their surroundings. It's not okay everywhere. But most places, sure.
It's fine as long as you don't over due it. <br />
As far as friends go, I know some people who i'll hang out with and they just awkwardly kiss even during the times when people are talking to them. That's awkward. <br />
As for strangers, I've been to the movies on a first date and a couple sitting right in front of me are making out ferociously, that's way too much, and NOT COOL!
as long as their not trying to make a baby i could careless.
something about morals or whatever