The first being the easiness of monitoring such sites and stopping with the bs of people saying they have no control over where these sites are. Two, contrary to many other issues, pornography has no fine line.
Sex education is very different from pornography and is quite distinguishabel at all times.
Sex educators concerned that their sites would be truned into .xxx sites are wrong in thinking so. Also, it is very easy to creat a consensus in all countries and the W3 consortium about how to write a law placing ALL pornography within .xxx boundaries. If someone mirrors .xxx sites in non-.xxx sites will be shut down, as well as any porn content. No more of this ridiculous discussion about viewing improper content since all eduational institutions including libraries won't be able to view .xxx sites, as well as small-huge businesses won't be abel to view .xxx sites, and whomever else wants to adopt simple software not to view .xxx sites. Its more simple than many people who created all this hassle in the first place, are thinking.