Intentional or no, this is pretty funny. Don't even pretend like you're above it. Because you're not.
The image is hosted on NASA's website, in a writeup about the Agency's Spirit and Opportunity Rovers (yes, the above image was apparently drawn by one of the twin rovers, not the recently landed Curiosity), which would suggest that it's legit.
It's interesting that the internet only caught wind of this photo now, less than a year after the bigger, badder, and much-adored Curiosity touched down on the surface of the Red Planet. Maybe Opportunity rover got a little jealous, has gone rogue, and is now vying for attention by drawing genitals in the Martian dirt?