im 21 years old all the sudden my penis seems to be more sensitive like within the last 3 weeks or so when i masturbate or even when i have sex but more noticeably in masturbation i ejaculate within a min or 2 and i dont even need any stimulation like i dont have to be watching porn or anything before i would last longer pretty much as long as i wanted to and to get off i would have to be watching some sort of porn also i noticed this light blue vein on the left of my penis that is more clear now that i didnt notice before and another thing when im erect i stay erect longer now sometimes even after i ejaculate i stay semi erect for a good amount of time after i dont have any pain or anything just dont know why all the sudden its so sensitive and doesnt take long for me to get off
Sudden premature ejaculation, when not present before, can be caused by a few things. Are you taking any new medications? If so, look at the side effects. Another possibility could be prostate infection. It would be a new development and can cause PE.
Other than that I wouldn't know. Perhaps soaps, lotions, etc. changes could cause sensitivities like it can cause sensitivities or irritation elsewhere on the body.