So sorry Eggface is having such a difficult time. I, on the other hand, love it here.
I am an older woman (51) from the US and have been living in Port Moresby for a year and a half. I drive, walk, shop, eat out, and work comfortably here. I do not live as an expat here (my neighbours are all nationals) but do exercise caution about when and where I go, particularly after dark. I do this in Houston as well, by the way.
I've never been shot, stabbed, or robbed, never been accosted, and only occasionally am I even uncomfortable. I have been to a play, a musical, sing-sings, the Saturday Arts and Crafts Market, a rugby match, a Christmas celebration on the beach (with nationals), and a crab boil by the pool overlooking the city (with expants); I sometimes head to the Yacht Club on Friday nights when I yearn to mingle with the expat community. I eat well, live well, and expect to be here another 3 years.
I work for a nationally owned company, am working on my PhD (Technical Communication), and make a decent income. My husband came for a visit after working for several years in Nigeria and decided this was so much better, safer, and enjoyable, so he took a job and decided to stay here a year as well. He works on a long rotation in Kutubu, so we don't get to spend that much time together, and he will retire when his contract ends in December and go home while I stay on here, living alone like I did before.
All I am trying to say is that it is possible to live here and enjoy it. Much of it depends on the person, but I agree with Eggface in that it CAN be a dangerous place here. (I've heard stories too.) I guess I'm just lucky. :-)