My underwear doesn't get dirty

Whenever I fap or a nightfall happens I can know what happens and It cums but never my underwear get wet with such a dirty white stain. There is only a water stain that easily get off while bathing?

That may be because there is very little sperm and much more semen in your cum. But really, I don’t know man… From personal experience this changes when you do PMO for long periods of time. Then the emissions get thicker and whiter, and cause stains like you describe

I think u need to get urself checked …that could be sign of infertility, or maybe too much pmo in past …
But I’m not sure …No further comments as I dont have proper knowledge of this situation.