I have heard different things Computer.
1) It is bad to ejaculate before or after PE because A) you want to keep your penis in the biggest state possible for as long as possible, and B) when you ejaculate your blood chemistry changes in such a way that far less blood flows to your penis, resulting in your penis shrinking down to normal.
Or
2) It is fine. There does not seem to be any logic behind the “it is fine” theory, but there are plenty of people here to claim to be getting gains while having an orgasm shortly before or after a workout.
Personally, I NEVER EVER have an orgasm before or after a workout. If i need to wank it, I do it as far from my workout as possible.
But, like all factors in PE, i am guessing that it has more to do with personal chemistry than anything else. Do what works for you!