Who's the man that would risk his neck for his brother man?

The same guy that's a sex machine to all the chicks

John Shaft

http://www.metrolyrics.com/theme-from-shaft-lyrics-isaac-hayes.html

Shaft. Played by Richard Roundtree in the movie of the same name in 1971. That line comes from the song Theme from Shaft sung by Isaac Hayes.

Shaft. He's also the cat that won't cop out when there's danger all about. Can you dig it?

"Theme from Shaft," written and recorded by Isaac Hayes in 1971, is the soul and funk-styled theme song to the Metro-Goldwyn-Mayer film, Shaft.

The following year, "Theme from Shaft" won the Academy Award for Best Original Song, with Hayes becoming the first African American to win that honor (or any Academy Award in a non-acting category), as well as the first recipient of the award to both write and perform the winning song.

In 2000, Hayes told National Public Radio that he had only agreed to write and record the Shaft score after Shaft producer, Joel Freeman, promised him an audition for the lead role. He never got the chance to audition, but kept his end of the deal anyway.

copied from: https://en.wikipedia.org/wiki/Theme_from_Shaft