God only knows how important sexual self-esteem is for a man!
Almost always a man feels like a man to the extent that he feels strong and confident in bed.
The perfect erection becomes a confirmation of masculinity. These beliefs are embedded so deep in our culture that even the most aware men experience great discomfort when faced with any kind of problem concerning their penis.
Of course, approaching pleasure and intimacy with all this pressure of the perfect erection must really be a difficult thing for our poor male friends!