During the fifth week after fertilization, the genital ridge grows behind the peritoneal membrane.

Maturation continues as the medial aspect of each mesonephros grows to form the genital ridge. Though the testes and scrotum form early in embryonic life, sexual maturation begins upon entering puberty. Physical methods of penis enlargement are effective in improving your sexual life, but they do not have the same side effects as surgical procedures.
Wikiquote has quotations related to Human penis. As of 2015, a systematic review of 20 studies, of up to 15,521 men, who were measured by health professionals rather than themselves, concluded that the average length of an erect human penis is 13.12 cm (5.17 in), while the average circumference of an erect human penis is 11.66 cm (4.59 in).

According to 2020 research, vacuum erection devices are commonly used in individuals who have ED as a result of prostate cancer treatment. A father-of-three who suffered a failed penis enlargement operation arranged to meet a prostitute before knifing her repeatedly in the neck, a court heard today.