0 Pooches: Do You Allow Your Pooches on the Furniture?

We have always been a 'no dog on furniture' household. Though it seems E and I are on either side of this rule.
When Miss M first came to live with me, I was very strict with the rules. Living with a dog like this:

I knew once I let her do something, there was no going back. So I decided not to have her on the furniture and we just became used to that (with a couple of sneaks on here and there). 

When Mr. B joined us, he followed our lead and learned they had free run of all the cushions and beds on the floor. I like having our sofas just for us, and not having to worry about cleaning or buying new furniture often, especially since we learned Miss M drools in her sleep.

Though with our outdoor couch, E thinks it's ok to allow the dogs on this furniture. He thinks it's more comfortable to have them all hang out together.
Though lately, a certain Mr. B thinks going on the outdoor furniture gives him free reign to all furniture. And lately, we've noticed a couple of stubby gray and white hairs on our white couch.

I don't think the pups can distinguish between being allowed on some furniture, or only doing it some of the time, so I think they should go back to their cushions on the floor. Though E says we should just continue to let them sit on the outdoor furniture, and just use a blanket.

I'm curious about everyone else.
Do you allow your pups on the furniture? 
Can they distinguish between the types of furniture that they can go on? And how often?
Or once you go furniture, is there just no going back?

Also:
Sneaky
Sneakier.

Caught!
Cleaning Couches.