What does "R rated" mean in gay porn?

What is r rated?

A rating usually given to movies or television shows, to indicate the type of content, and to which audience it is suited for.

Definition

Usually used to denote a move/show that contains course language, violence, nudity, and sex. It should be noted, that the sex shown is of a non penetrative kind, though it may be explicitly implied. It is not shown. As well, the nudity may include frontal nudity, but does not show a fully aroused male genitals.

Noteworthy: Originally developed by the movie industry to stave off Government regulations.