Its the ligament on the left side. When flaccid i can pull my penis over to the left easily but if i try to pull to the right its way more restricted and it doesn’t like if i force it over (firms/tightens up). After masturbating it tightens and if i press on it by the base with a finger it almost stings a little. If i try to pull and atretch it out it tightens even more. I have a curve towards that side that is worse after ejaculation. It is visible erect too but its more of a lean. It doesnt hurt but only aches a bit if i press on it with a finger. The whole left side of my penis from the base to the glans is usually firm and worsens after sex/erections.