I can now confirm that my pleasure-pot has been verified to be 6 inches deep. Allowing for a bit of flexibility, external flesh and knob sqidging, 6-8 inches of penis seems to be around the ideal size - before repeated boning gets an uncomfortable feeling of being internally bruised.
Now I rather enjoy quite a vigorous shafting (hence creating the phrase "fuck me like you've paid for it") and the feel/sound of skin slapping on skin.
So, it leaves me wondering what it is that gets some women to talk about 12 inch dicks as if it was something wonderful and what they do with the extra 4 inches?