Reading through your other posts, this is the first time you've mentioned this symptom that I can see.
When you had testing done, did they just do gonorrhea and chlamydia testing, or did they look at your urine for white blood cells? You could have urethritis, even if you don't have any burning or pain when you pee or ejaculate.
The other thing is that it could be an allergic reaction or sensitivity - are you wearing new underwear, using a new laundry detergent, new soap, anything?
It could also be anxiety and a hyperawareness of the area, for sure.