Hi everyone when I was in my teens and 20s and even 30s I've always been able to keep a solid hard on I've got a big cock and the ladies love it and the odd guy too however since i reached 40 I've noticed my erection not as hard as before and also on the odd occasion my cock as gone soft half way through sex it also goes soft when masturbating is this psychological or something else can anyone tell me how to keep a solid hard on again please x