Why the urge to pull out?

[omonundro]

Once I get inside a vagina, my inclination is to stay there as long as possible. Anybody have a guess as to why when dogs mate with women they seem eager to pull out quickly?

 

[pes]

Pulling on the knot is a natural behavior. In reality a female dog has a special ring muscle which holds the knot in. Pulling on the knot brings pleasure. A human vagina does not have the ring muscle which is why pulling on the knot most often leads to the penis slipping out.
People have to learn to use their hand to hold the knot.