reading through some of the posts on here should be enough to get you wet.
I second the toothbrush and go to ann summers for a visit.
vibrator are magic and I can come in about 6 seconds using one!
Obviously I like to prolong the experiance but I have a really sensitive clit so I use it around my lips and folds around my clit until i'm really wanting to cum.
It builds up like ripples sometimes in your tummy but mostly in your lips and clit. Then peaks and you get what feels like mini explosions all down below and sometimes if its particularly powerful you get a squirt of female cum.
Sometimes a mild orgasm can feel like an intense need to pee.
We are all different and you will know when you achieve one.