My other half told me her ex before me had a long penis, about 11 inches, but it was on the narrow side and he had no idea what to do with it. That and he would constantly whine during sex. In fact, when we were dating and broke up for a bit, she went back to him for a night of closure sex. Halfway through it, she stops, and tells him to get out. She was reminded why she didn't like him and left him in the first place.
Next month, she's back with me banging like mad.