The female prostate gland or "g-spot" isn't the same size in every woman and or even the same place. It controls the woman's natural lubrication the same as in men it provides the fluid for semen to gush out and squirt with. Men however are taught from day dot that having an orgasam involves squirting fluids, whereas women are not taught this anywhere that I know of and as a result the sensation so easily confused with the need to urinate causes embarrassment and tightening up of the pelvic muscles restricting the orgasam.
So for some women born with very small or deeply positioned prostate's achieving release is literally hard for them on a physical level. For other women it's nothing to do with physical difficulties, just the mental blocks that years of training into themselves have created.
Studies from Germany and Netherlands have shown that there is a direct connection between a women's emotional state and the level of intensity her orgasam' s can achieve, i.e- if she ain't in the mood, it ain't gonna happen.
Sadly we do not educate our daughters properly in regards to how their bodies can and should behave.
Sadly many ignorant men still persist in berating women into believing that their just urinating.
Sadly very few women gain the simple confidence to let their body respond naturally to how they feel physically and emotionally.