Not a hairy knuckled troll. As per: Mexican house thief, Malibu and Cancel the cheque...
Recently my Partner has found a sweet spot that seems to make me 'gush'. I've done my research and am well aware a lot of people believe this to be urine. I personally don't think this is because it doesn't seem to come from there, but fine, if that's what it is, that's what it is.
I can 100% say that it certainly doesn't smell, or look like it at all. I was massively embarrassed the first time it happened and spent much time examining the 'wet stain' after.
This is after very 'vigorous' stimulation to me. Not fisting, but full on strong stimulation different to PIV or anything else.
However, since we started doing this, I've noticed my pelvic muscles seem more 'relaxed'? I've not born children, and although in my early 40's they have always been good until now.
Sometimes now when I cough too hard I wee a little. 
This NEVER used to happen. Is it a cause of the stimulation or is just age? Do I just need to work on my pelvic floor more and make sure the stimulation isn't affecting this?
I'm a wee [pun] bit embarrassed about this.