It might look like Sony is simply putting another black mark on it's reputation in this community, but take a step back and look at it comparatively.
Apple, for instance, adopts a very strict closed policy, both when it comes to security and adult content. You won't find it in the app store. This matter is subject to debate, both from those who want it on their iPhone, and those who are pleased to have a clean device.
Sony, through your eyes, seem evil because they also have a closed software platform, which they justify by saying that they do so to protect developers from piracy. You should expect any business, in the gaming industry or not, to protect their partners. It stops them from being castigated themselves.
But what Sony have done here is not to fabricate their own adult movie service, but allowed one to join its platform. Because it is what thousands of consumers WANT. They're not going to plonk it straight it in the XMB or force you to sign up. People who aren't interested won't even notice it.
Sony is simply giving consumers choice. This is what all of us want, we just want a different kind of choice. I'd love an open software community on the PlayStation, and it's not exactly like this is a step back, is it?