I suspect the grainy spooge is actually 1-AD that recrystallized in your bladder, deposited in your urinary track while pissing, then got shot out when you blew your load. I was on 1-AD for a while and noticed that it burned when I pissed. So I pissed into a clear glass bottle and under close examination there were tiny clumps of a white substance that I suspect was 1-AD. Within about 24 hours of discontinuing 1-AD the white clumps in my piss disappeared and the painful urination subsided . . . .
So you may be giving your girlfriend a dose of 1-AD - LOL!