Testosterone increases availability of carotenoids-- Androgens and carotenoids play a fundamental role in the expression of secondary sex traits in animals that communicate information on individual quality. A crucifix in the St. Charles Borromeo Catholic Church in Warr Acres, Oklahoma, depicts Jesus with a distended stomach and abs — which some critics say looks a bit too much like an erect penis and scrotum. The penis is an external organ of the male reproductive system. The root and body of the penis are spanned by three masses of erectile tissue. In the root, these tissues are known as the left and right crura.