from my experience, needing to pee is an affect of a building orgasm, following an orgasm, or just needing to pee. the girl im currently dating pees a lot anyway... and i mean A LOT.. like 8 times a day or more.
she often feels the need to pee during intercourse and sometimes it is purely just becuse she needs to pee. other times its due to the g-spot pounding and sometimes its after she has orgasmed.
one thing we have discussed as a couple is, she finds it hard to overcome the feeling of needing to pee and just go with it. ive only mmanaged to give her 1 g-spot orgasm out of the may orgasms shes had (tends to be A and C-spot orgasms) and she really enjoyed it. sometimes though i believe the feeling of needing to pee can be so intence that she fears she is going to pee on me. which would actually, more than likely, result in a squirting orgasm than her actually peeing on me.
it seems to be a big barrier for a lot of women to get over. in the last 70 or so years, more and more people are beginning to realise that female ejaculation is a reality and that even though it feels like they need to pee, a lot of the time it is a buiild up of pressure on the periurethral gland/skenes gland (or female prosate). it is stimulation of this which causes female ejaculation and has shown on many occasion to be a result of g-spot stimulation.
this is due to the g-spot being located along the course of the eurethra towards the neck of the bladder. which is why the feeling of needing to pee is often present during g-spot stimulation. heavier g-spot stimulation in turn causes a heavier feeling of having to pee. the reality is however ifyour girl has been to the toilet before you began having sex, then you have hit the g-spot and a mind blowing orgasm is to follow.
if she hasnt peed before hand, allow her to pee then when she returns you can carry on as normal. if the feeling returns, it is not possible for her to pee again as her bladder is now empty so you can go for gold and neither of you have to worry about your girl wetting the bed or peeing on you.
you should be able to gether to climax with confidence if she has an empty bladder.
hope this helps, blu.