How Can Slight Erectile Dysfunction Be Treated?

actually right before intercourse, my penis always
do not swell and remain hard for a very long
period which is actually useful for intercourse. It
only hardens fora short while only . But it
remains hard for quite a long time just before
urination. at the same time my ejaculation of
fluid is normal . only guide me how to excite
myself and keep my penis hardalong with
swelling for quite a long time .