For what seemed like a long time to me, it was the only place that was willing to cover Agent Orange.
Which is mostly a crock, as I understand it. (google Micheael Fumento, an occasional freeper who has covered the story.)
I am referring to the mid 70s and I am going by my memory. There may have been other coverage I was unaware of at that time. Also, I am not commenting on the quality of coverage, just that Penthouse covered it.