I, personally, want to lose my virginity with someone special, if I do it at all (I don't really find it appealing right now but I might change my mind if I find the right person). I'll probably wait until I'm married, because then obviously (hopefully) that person will be special enough. I'm only 17 now, and I don't feel I'll be losing it for some time, though.
But if someone just likes having sex, then as long as they keep safe and don't hurt anyone, they can go ahead. It's a natural bodily function and it's actually apparently pretty good for you, on a mental and physical level.
However, don't do it in public. That's just unnecessary. >w<