http://68.media.tumblr.com/4a6609c385cd6c9323a9216631deb29c/tumblr_ojde6ktk0C1ts02gpo1_500.gif
more bizarre xxx pics in category Breeding
from #thread (https://reddit.com/r/Breeding/comments/5xu04c/when_you_feel_the_splash_against_your_cervix/) by @UnspokenDesires
This is why doggy is the greatest position for this...the deep penetration is best when you feel his cock swelling right before he cums. Feeling the cum hit my cervix pushes me over the edge every time.
Seriously need a source for this.