Cumming??

Less than 6%.

You may find the following info useful. I have copied this from a reply to another question that I posted a few hours ago but it may answer some of your questions:

I think there is some confusion over the use of the word ‘cum’ when talking about females.

To cum - Usually means to have an orgasm. The pleasure that a woman gets at the peak.

Cum - Is used to describe the increase in lube that most women experience at the point of orgasm.

Howeverm some people who have watched one porno movie too many (and in most cases this is faked by the woman pumping water into her vagina just before the shot is filmed) use it to describe female ejaculation. This is what happens to a minority (a very small amount) of females when they have an orgasm.

A clear fluid squirts out of their vagina. (not to be confused with increased lubrication as explained earlier) This is also known as female ejaculate. (look it up on the net) and there is some dispute with specialists over what exactly this is and the purpose of it. In some cases, there can be almost a mug full gushing out.

Female ejaculate is not just lubrication increased at the moment of orgasm. Many specialists believe this although it is not urine, it comes from the bladder because that is the organ that can hold so much fluid.

Also only around 6% of girls can do this. Those of you that dont ejaculate but still get a lot wetter when they orgasm are not experiencing what is termed “female ejeculation”, just a very wet orgasm.

It is not urine as it doesnt have the same make up as urine but it is almost undoubted to come from the urethra.

Hope this helps.

Kiasu