Nope, porn/anti porn is a purely subjective thing so you can label whatever you like as one or the other, or even both depending on your mood, and others can choose to agree, disagree or not bother reading. It really doesn't matter and hence the idea that discussions around it are basically of a wanky nature.
Whereas whether a bike is safe enough to ride, and will work, is rarely subjective, or at least not in the same way.
So start a "safe to ride" thread. If a thread is called "Bike Porn", it's where people want to post pictures of bikes that look so good to them that it bypasses their higher functions and connects to something more primal. Doesn't have to be wanky, either; there can be some interesting discussions to be had about it. One potential topic of interest can be how acquiring greater familiarity with the function and practicalities of a technology can change your view of the aesthetics - which is not at all the same as giving up and just saying "function vs. wank"
People want to post pics of bikes that make them sigh as they roll past. Maybe some other people need to learn to live with that.