Hi, thank you for using health care magic. I can understand your concern. For premature ejaculation use start-stop technique and squeeze technique. This technique affects the conditional reflex of ejaculating early. Over the time the ejaculation time is set at longer then previous. You can also try condom or specially condom with jelly having property of reducing the excessive sensation of top of the penis. Medicines like SSRI group (sertraline,escitalopram,peroxetine ) and clomipramine can also help in delaying ejaculation. For use of this medicine you need to consult doctor preferably psychiatrist. Watching porn or masturbation does not affect men s sexual health. Curved shape of penis usally does not produce any problem if while erect it become rigid and straight. If this is not happening while erection in your case then consult a surgeon also for curved penis. I hope my answer help you. Regards.