Well this fell away fast, didn't it? You're lucky I'm bored at 3:25 and trawling past page 2 to dig it up.
I played SL for a long time. I actually got addicted to it. It was immensely freeing during the angsty period I went through in which I felt completely ignored and helpless. In SL, no-one has to know who you are, so you can be what you want to be. I, for example, spent almost 3 years on there whilst underage, and no-one either asked nor guessed it of me.
As for the actual gameplay, it's boring as hell unless you make something to do for yourself. I built stuff with the content creation tools, and I was damn good at it, made a few dozen real-life pounds out of it, although I missed out on the big pay-out because I deleted my account before taking the money off. Over £300, I think it was. Ugh, hindsight.
Yeah, there's a lot of weird stuff, probably because there's a lot of people with anonymity, and the ability to do/become whatever you like. As a general rule on there, it's not acceptable to try and delve into someone's real life. It's just not done, so don't worry about that.
It's become much easier to avoid all the sex now, though, as the devs actually made a whole new adult continent which all of that stuff is being relocated to. You now have 4 or 5 continents altogether, and this new one is only accessible by those who have verified their age with the devs.
To be honest, though, there are very few jobs. The only real source of money is content creation, which you either can do or can't. If you can draw, animate, code, or model, you're set. If not, well, better get used to relying on the kindness of others.
Hell, I might as well answer any questions anyone has about it, since I seem to be the only person on these forums that's spent a lot of time on it.