I don't agree that the body can control the pregnancy part short of direct intervention by contracteptives or celibacy. It might be designed to INCREASE pregnancy but semen is designed to impregnate despite her bodies actions or inactions thereof.stretcher74 said:The arroused cervix is on essentially the roof of the vagina and sperm pools on the bottom underneath it(aside from flowback). The cervix then dips down into this pool and sperm can swim up through channels in the cervical mucus.
These details are important because together they allow the female(body) to essentially control when/if it becomes pregnant.
I agree though the cervix dips into the pool during orgasm. I've seen it on film and some of you might have felt it. The presence of semen ALSO influences orgasm/dip in some women as well. Now we might understand why some men have unconscious desire to bring a woman to orgasm thru penile penetration.