The purpose of this article is to present current strategies in the management of this physically and psychologically debilitating condition. Truly Small Penis vs. In using reference points Adult men with an inverted penis deciding that one's penis is small, there are at least two types of data you can compare yourself against. If an erection is possible, it may still be difficult to have sexual intercourse. Montague, about one third of the erection chambers in the penile shaft are inside the body and two thirds are outside.