Erection dynamics

Dear Dr. Milrod: I have found that I have a hard time sustaining an erection while lying down, for example, when my partner is on top or similar. However, in missionary, doggie or other positions when I am standing or on top, I am good to go. I don’t think this is psychological. I have no medical credentials, but could this have something to do with blood flow to my penis, meaning “downhill” versus “uphill” flow?  Seems like I have situational erectile... Read More