Premature Ejaculation is a problem for males who have erection problems (erectile dysfunction or ED). This is when men are not able to get or keep an erection that's firm enough for sex. Since an erection goes away after ejaculation, it can be difficult to know if the problem is Premature Ejaculation or Erectile Dysfunction. ED should be treated first. Premature ejaculation may not be a problem once the ED is treated.