Mark MacKillop-729.jpg

Whew! 

Agreed.  Definitely not Beckham, who is not only covered in tats, he's skinnier than this and not nearly as hairy.

Brock with superstar Jim Pulver.  See the additional comments to image #023.

Like #020, this is a collage of screenshots from Matt Sterling's classic video, "Bigger than Life," in which blond stud Jim Pulver fucks Brock in a subway car.
In "Inch by Inch," Sterling's "prequel" to this scene, Pulver gives hottie Jeff Quinn a similar pounding on the same subway car, with two ... count 'em, two ... separate cum shots.  At the end of the scene, Brock walks into the subway car, setting up the scene in "Bigger than Life."
This album contains numerous larger images that are screenshots from this scene.

Oh, lucky, lucky, lucky Kevin Williams, to have been in such an enviable role at his tender age.
@ColtMann has an extensive album of Williams's images here: