The "you" in this post is the general "you". I'm saying this to be clear for the readers who don't speak English.
It would be good to remember that just because a vendor doesn't ask to see ID before selling rated material to someone, it doesn't mean that vendor won't be held accountable if an officer witnesses the vendor selling material to someone of an inappropriate age.
One of the best examples of this practice is when Excise police officers run crack-downs on local alcohol vendors, most especially in college towns on the weekends. They go into a store and if they see a sales clerk selling alcohol without checking IDs, the clerk and/or the store receive a fine or other censure, up to and including prosecution and jail time.
If a knowledgeable police officer witnessed a youthful-looking person purchasing a BL book rated OT (older teen), +16 or +18 without the salesperson checking the purchaser's ID, that officer could step in and either impose whatever penalties are at the officer's disposal, or the officer could issue a ticket with a court date for the case to be prosecuted to the full extent of the law.
All of this is subject to federal, state and local statutes, and local law enforcement can choose to police or ignore vendors that deal with age restrictions at its whim. But all it takes is one upset mother complaining that her child was sold BL "porn" to get the police inside a local Borders, or at the ticket counter of the movie theater, or outside a liquor store. The localities of all 50 states have standards by which they choose or not choose to handle age-rated or age-restricted material.
Ratings on most media and entertainment are seen as guidelines for parents and other purchasers to follow. But ignoring those guidelines can open up vendors to lawsuits, boycotts, and prosecution, depending not only on local morality, but on local laws that might take the ratings on media and entertainment more literally.
Bottom Line: What I'm saying is that this isn't necessarily a debate on whether BL is considered porn or not. The fact is, there's ratings on all BL books, and if stores don't choose to enforce the ratings on their purchasers, the stores have potential consequences to face, from mere customer outrage all the way to prosecution.
This is the reality of selling BL books, whether or not you consider them porn. This is also why it's not a good idea for people who are under the age ratings to flaunt their previous purchasing successes in a public forum. One upset mother raising a stink is all it takes these days to set in motion something like, for example, Target.com pulling all BL or even all manga from its site.
Businesses will always cover their own butts unless it involves enough consumers to make fighting for something worth it to their bottom lines. If you want to continue to have many channels from which to buy rated material, you can either play "the game" quietly, refuse to play the game by making no more purchases of rated material, or you can fight the system from the ground-up. I'm not advocating one or the other, but those are the only choices I can imagine.
Like it or not, this butt-covering is most likely why DMP chose to make the 801 Media forum closed to those under 18. The books are all rated 18+, so there's no reason to allow anyone younger into the area. Right now, I think it's pretty good of DMP not to have restricted ages on their other forums. June books range from 16+ to 18+ (are there any 13+ June books? Don't answer that here, heh, rhetorical question). DMP would be well within its rights to restrict access to the June forums to 16+ or even 18+, but I suspect that, 1. DMP would like the forums to be welcoming to as many of its fans as possible, both young and old, and, 2. DMP staffers don't quite know how to add another level age-restriction to its forums (*ducks rotten tomatoes from the mods*
). Yet? We shall see!