Minnesota
Where does it come from, is it actually cum, is it pee, What is it ... and the good old Wikipedia 
Where do you think it comes from?
To take a quote from the movie, Little Big Man.... "sometimes the magic works and sometimes it doesn't."
Squirting is a little like that for me.... But generally I can make it happen..... HAVE to have the right stimulations...... and then.....Look Out! Thank God for Jane Doe, she taught me about using those absorbent liners on the bed..... I was going through too many towels! 
OH, and I do get an orgasm like sensation Prior to squirting, but not an added sensation because of the squirting.
Jeez, all this talk about squirting...... is making me want to..... well, ya know..... SQUIRT!!
This has been discussed before.
I asked my doctor. They have done studies where they (sorry can't say who "they" are) have used a dye which comes thru a person's urine....administered to a woman and she then squirted.....no dye was in the liquid expelled. Medical proof it's not urine although my dr could not say exactly where it comes from!
And having been with Amber AND Jane Doe and also having squirted myself when fingered and well hydrated...It is NOT urine.
Those sheet protector pads are available at Walgreens and Target stores.
Spanks and squirts,
Sassy Red