It doesn't have anything about Venus, but the Mars part sounds exactly like "Moonrise" by Dorothy J. Heydt. I read it in "The Best of Marion Zimmer Bradley's Fantasy Magazine" (1994), but it was originally published in the summer 1988 issue of Marion Zimmer Bradley's Fantasy Magazine.
The synopsis from Heydt's website says:
The first manned Moon landing changed Vilkas's life. Now, while war threatens, he's waiting for the Mars landing.
Vilkas, the main character, was a werewolf, and the story (after a brief intro) flashes back to him preparing to transform, the night of the first full moon after the moon landing -- but he didn't transform, that night or ever again. Another character complains about humanity's arrogance in setting foot on another world, saying they've "taken all the magic out of the moon."
Many years later, worldwide tensions are nearly ready to erupt into war. Vilkas is a senator, chairman of the Space Committee; and he's in the press room at NASA, counting down the minutes until the first manned landing on Mars... and he's watching the headlines, waiting for the fighting to stop.