First of all, you will have to change your attitude. Nature didnt invent the term "premature ejaculation" its a man made construct. If a person is satisfied with his sex life, of what ever duration, then everything is OK. But if a person is not, medical science can help, but cannot change that person or his behaviour. Ejaculation is a learned behaviour. while growing up, as a ,man learns to masturbate, his body reacts to the sexual impulses generated by the act of masturbation or sex, and begins a ejaculation reflex from brain and spinal cord, which is difficult to control. Very few persons can master this and control their ejacualtion. Unfortunately, seeing porn and hearing about "long lasting capacity of friends," many want it, but it cannot be willed. Medicines may work in some, but not all. Because finally it is about reducing the "excitability" induced reflex action, either by self control or medicines. So If you feel you have taken every medicine that can be used and googled, then there is no way one can increase the staying time. premature Ejaculation is not a disease. its a dysfunction. By that it can be helped, but NOT CURED