Getting it up without stimulation is a challenge

Hello. I am a 21 year old virgin who is just beginning a sexual relationship with a beautiful girl. We’ve encountered difficulties, and an important question has come to mind: What is a healthy erection?

Most web sites just say that it is being hard enough to penetrate a vagina, but that is nowhere near specific enough. At its peak, how hard should it be? How much should it bend to pressures from different angles? Should it point upwards? Should it require no physical stimulation under otherwise ideal conditions to become this erect?

How quickly should it return to being flaccid, ,limp, weak and hanging once stimulation is broken? I’ve been very worried about how well my penis is functioning, and seeing answers to these questions would help a lad figure out my sexual performance inhibition and erectile dysfunction difficulties.

antonio answered