"But some are concerned that it would encourage more porn on the net."
Really does anyone believe that anything would encourage more porn on the net. From what I've seen, and to be perfectly honest I've seen an awful lot (and a lot of it was awful), it woud not be possible to encourage more porn. There is really no shortage of porn out there, I can't believe there are that many would be pornographers who aren't already plying their filthy, wonderful trade already.
But then again I'm not the president.