Hi Tom, not may people advise here but as mentined if you had Gono you would have a white puss discharge, its possible that chlamydia might not show signs but ive had both 3 time in my life and always got a puss discharge, burning while urinating and with chlamydia, itching inside my urethra. These are the most common stds.
Not showing symptoms would be more with women as they can have it inside the vaginal area which is an open cavity. Men only have the urethra and i would say the in the real world most men would certainly have symptoms with gono and chlamydia esp the itching inside the penis.
Also not showing symptoms may be the case when you first get it but after about 7 days symptoms in men would surly appear in my opinion from experince.