Hope it helps.
I think my g-spot was stimulated before we "discovered" it but I was holding back some. After we'd have sex I'd always go pee but I never felt like I emptied out. I'd sit on the bowl and within half a minute my bladder would empty out a second time. Best I can guess is that my paraurethral
glands had filled during sex but afterwards since they weren't emptied out, once I peed, and relaxed, then I was able to just empty out again. It felt like a double pee if that makes sense. Now that I squirt, after sex I'll still pee but it's not this double thing I had years ago.
Something else weird...since I got my MRI back showing the 2 herniated disks at the bottom we now understand why doggy is painful. LOL It was the weirdest thing, we'd start to go at it doggy style and if he penetrated me with his full length I'd get this electric shock by my tailbone with pain going down into my leg! Oddly, but thankfully, this doesn't happen with anal. 
I also noticed my siatica hurts worst during my period...lucky me, my period started this afternoon.
The body is an amazing thing.