Suggest Remedy For An Infection In The Penis

I have little oriented penis on the time of erection, but when I visit urologist he answered that it is natural and after seeing my penis photos he said that it is not curvature, but when I have sex the left side of my penis is extremely in the moving and after every sex the left side get red and I feel little pain , but it disappears in one day. Can you answer - is that penis problem ?