Hi there, thank you for posting your question. My area of expertise is in human sexual dysfunction. I hope I can be of some small help to you.
Are you trying to describe premature ejaculation? This is described as ejaculating during arousal or immediately after penetration. If this is your problem then there are two possible solutions. One is a quick temporary solution and the other a slower but permanent cure. You do not have to endure PE. It can be fixed.
Dr Andrew Rynne.
www.andrewrynne.com