Los Cachorros

Los Cachorros ("The Cubs") is a 1973 Mexican film drama directed by Jorge Fons and written by Fons, Eduardo Lujan, José Emilio Pacheco based upon the novel "The Cubs and Other Stories" by Peruvian writer Mario Vargas Llosa. 
Plot.
It tells the story of a group of friends that stand by each other well into adulthood. The film starts innocently enough when young Cuellar (12-years-old) enters a new school. He immediately makes friends with 4-other youngsters. One day after soccer practice while taking a shower, a vicious dog is let loose and it severely mauls him devouring his genitals. He is as a result maimed for life and this novel uses his development into adolescence and later into adulthood to explore the problems he faces. These are both sexual, obviously, but also his lack of hormones very much changes his relationships with his group of close friends and he finds it very hard to come to terms with the fact that they start to get girlfriends, and later, married. Italian title: Eviration - Bramosia Dei Sensi.
Awards.
Ariel Awards.
The Ariel Awards are awarded annually by the Mexican Academy of Film Arts and Sciences in Mexico. "Los Cachorros" received two nominations.