Although I prefer to do my own freelance and I have several longtime non-adult and adult customers that keep me busy with some frequency, I have special daily/weekly/ or even monthly rates much lower for contiguous work, like Amp said - it pays to eliminate the hassles of constantly start/stop new projects/clients. But I can't compete with a company like adultoutsourcing, those guys are likely east european/asian and work for much cheaper.
So in case you're checking portfolios anyway, here's mine
http://www.sexymojo.com/design if you are interested email me for rates or to work something out.
I also have print experience and illustration and functional script skills which I don't offer or display on my site.