I live in one of the (no doubt many) places in the US of A where you can walk into any hole in the wall and buy a 12 ga. shotgun or a high-powered rifle for yourself or your child about as easily as a six-pack of beer. Anyone selling you a "non health related" vibrator would be arrested.
Over here in germany it's exactly the other way round LOL ... there is usually an erotic or porn shop or whatever in every city and no one has a problem with that. Erotic mgazines can be bought nearly at every newsstand or supermarket and although they are usually in the top row of the shelf they are not hidden behind other stuff but you can find then the front row. Buying a weapon is a completely different story. There is no way to buy a gun for someone who has no gun licence and I have no idea where to find a shop that sells guns over here - at least in my city you cannot buy weapons, we do not have that kind of shops. To get a gun licence you need a very good reason - just saying I like to buy a gun to have one will prolly earn you a kick in the butt or further investigation what you might have in mind when you have access to guns. It is seen as criminal - someone who wants to have a gun is suspect because over here no one except the Police, security people or foresters have the right to have a weapon. And I feel very comfortable with that.

Every organisation rests upon a mountain of secrets ~ Julian Assange