I don't do the 'all fours' thing except when I have my hand wound in her hair and I'm motivated to relocate the scene to another room...
but I doubt there are many dom/mes who don't enjoy having their sub under tight control.
I just think you've not seen it discussed because it's kinda ubiquitous...It's a sensation of power and humiliation, I suppose, but most people don't seem to enjoy this activity (even many who are into bdsm) and I would never ask someone to do something they weren't comfortable with. It can hurt, too; when pulling on a lead, it should be done from the front to avoid hurting one's partner.
I'll agree with the power sensation... and the humiliation factor depends on how it makes the sub feel... most I've known have the opposite reaction. They love the feeling of being controlled. Take them out into public that way... then embarrassment/humiliation plays a factor.
Heheh... I'm gonna twist the question a bit.Since most people here are far more active or knowledgable than I am, I wonder what you think--should a good sub be allowed to go around unleashed?
A "good" sub is always on the leash... sometimes physical, always mental.