Marlon Brando was an American actor and director. He is considered one of the most influential actors of all time and was one of the first actors to popularize the Stanislavski system or method acting. 

Brando started acting on stage in the 1940s, where employers had to weigh the benefits of his enormous talents with his erratic and temperamental personality. In 1947 he got his breakout role playing Stanley Kowalski in A Streetcar Named Desire on Broadway. In 1951, he repeated the performance in the award-winning film of the same name. 

He continued to see success, winning Best Actor for his performance as Terry Malloy in On the Waterfront (1954) and for playing Vito Corleone in The Godfather (1972). He was known for bringing remarkable intensity and verisimilitude to his roles, often crafting iconic performances. 

As Darwin Porter noted in the Sunday Times of London in 2006, "Marlon Brando was bisexual and voracious. The roles he lived off-screen were even more provocative than those he created in films.”[1]

There were many rumors about Brando's various male lovers, including Richard Pryor and his childhood friend Wally Cox. After Brando's death it was revealed that he had kept Cox's ashes for 30 years, and had the pair's ashes scattered together.[2]

Although Brando was not openly dating men, at least not in front of the general public, he wasn't very secretive either saying, 

Homosexuality is so much in fashion, it no longer makes news. Like a large number of men, I, too, have had homosexual experiences, and I am not ashamed.[3]

Marlon Brando was also married 3 times and had 11 children, some biological and some adopted.