44y old male. strong odor in the genital area. no other symptoms (incontinence, rash, pain...). blood and urine culture tests normal. urination normal. hygiene properly maintained, underwear changed every 2-3 hours. it has been going on for 4 months?

You are noticing a change which tells you something is abnormal. You have has tests done which seems not to provide an answer. Go and see a physician to have the condition checked.

Smell is a very powerful sensation and can be very subjective,. If it was very strong people in close contact would have smelled it too. Suggest change your soap, change underwear once (cotton) and try using a non alcohol deodorant locally. Hope you come out smelling like roses