Erectile dysfunction makes it difficult for a man to get the hard erection that is necessary for a sexual act. Anyone who cannot get hard erection in more than 50 % of cases is said to be suffering from the erection difficulties. Here we are discussing how to stimulate a man who is facing erectile dysfunction. The problem here is that a man is sexual stimulated enough, but still cannot get the hard erection. If question is sexual stimulation for hard erection, then we need drugs like Cialis 20mg to get the erection for penetrative sex.