How does a guy cum using scientific explantion

Basically I am a guy and I never study any biology, I heard from a friend that when there is some pressure point in the penis when rubbing with some object the pressure which will cause the penis to eject the semen which contain the sperm. Pls correct me if I am wrong.

I also don't understand how does a woman produce the juice? Even I watch so much hentai I still don't understand.

Read more hentai, there's a scientific explanation in almost every doujin. They even explain how cumming buckets is possible.

http://en.wikipedia.org/wiki/Ejaculation
I suppose that "pressure point" would be a prostate.

Is it really that hard to find explanation?

Thank for the link. I go and read the explanation there.

You mean this?

Wow that is a lot of math calculation/convertion. I only understand the red circle you circle.

Ok thank to your link, I found out where the female juice come from.
According to Wikipedia:Female ejaculation (commonly known as squirting and gushing[1]) refers to the expulsion of noticeable amounts of clear fluid by human females from the paraurethral ducts through and around the urethra during or before orgasm.

It seem most likely before the ejaculated the fluid must be stored somewhere in the pelvis, of which the urinary bladder is the largest source.(taken source from Wikipedia)

...if we really want to know we'll google it

wow... odd o.o

and you didnt know that before?