have you ever been in the unfortunate circumstance where you had an erection but you didn't want to I'm Dr Rena Malik urologist and pelvic surgeon and today we're going to talk about random or unexpected erections so what exactly is an erection well it occurs when the muscle of the penis relaxes allowing blood to fill the spongy tissue within the penis causing an erection it usually occurs when you see something hear something or feel something erotic sometimes it can even occur in a simple situation where maybe the clothing rubs the genitals and you're having an erotic thought let's go into t...