Everyone is different. you gotta feel it out yourself.
Basically, after PE exercises, you'll want to keep a good amount of bloodflow to your penis/groin. This will help with recovery. usually, when men ejaculate, blood flows away from the penis. The thing is, with me, my penis tends to be more engorged after masturbating. I still have a refractory period, but my flaccid penis hangs lower and larger then usual, the veins are more pronounced, and it's much warmer. I can feel my heart beat down in my groin sometimes, too.
Some men shrivel up.
I'd still say keep it in moderation. don't masturbate RIGHT after PE, give yourself an hour or so.