Hello ! I am a 20 years old guy and i have problems with my erection. Namely, when I masturbate I achieve full erection, but if I stop for couple of seconds it start to lose it. It is the same with girls, when we are beginning with the forplay I have the erection but I keep losing it very easly, and it is impossible to get it back. Sometimes I feel like I am going to get the erecion ( i feel like me penis is getting pumped up with blood) but it just achieves 1/3 maybe of a full erection, making it impossible for a sextual intercourse.