Im able to get an erection..but if i stop penetrating and start just doing her other things i like to do...my penis get soft and is hard to penetrate again..same when i finish..penis just can not keep erected to continue..why is this and how can i solve t

Time for checkup...: First things first, you should have a thorough checkup looking for things like diabetes, hypertension and high cholesterol - all which can affect performance. In fact, those are probably the top three reasons why men have erectile problems (throw smoking up there too - tobacco and marijuana). Before anything else, you should have these checked first.

Urology consult: Several causes for this including lack of blood supply, leaky veins, stress and fatigue. You can try viagra (sildenafil) but best would be to consult with a urologist.