It’s completely normal to lose your erection after orgasm and ejaculation, says Dr. Kok.
“The younger you are, the longer it will take you to lose your erection. The older you get, the quicker it will happen.” According to Dr. Kok, there’s nothing you can do about it.
“A man needs more direct physical stimulation to get erect and maintain the erection as he gets older. It’s untrue that men are able to get instant erections at all times with only visual stimuli, sexual thoughts and fantasies.”