A short list of practitioners of...

 ...Semen Retention!

King Solomon

Yellow Emperor Chin Shih Huang Di

Prophet Muhammad

G. I. Gurdjieff

Muhammad Ali

Eric Clapton

Joe Frazier

Ally Khan

Jim Carey

Jake LaMotta

Kanye West

The Cathars

Mike Tyson

Andrew Carnegie

Muddy Waters

Sultan Murad III

Frank Harris

Napoleon Hill

Miles Davis

Willie Dixon 

Sigmund Freud

Steve Jobs

Sultan Suleiman the Great

Nicholai Tesla

Mahatma Gandhi

Manny Pacquiao

50 Cent

Blaise Pascal

Socrates

Orland Bloom

The Shakers

The Oneida Community

There are so many others. Next I'll give some practical tips and practices.