I am unmarried & used to masturbate daily watching porn. I am fond of it. But I have noticed that during sex with my partner my penis looses its strength in short time. It becomes hard so fast but becomes soft in a minute. I have control over my ezacution so I do not cum early. I can hold my ejaculation for long time. Even when we are changing our position I used to find that in that gap of time my penis has already lost its strength. Then my partner had to do techniques to rise it up. I am loosing my confidence &,panicked to get married. Please doctor help me out of these. Its my request.