Having boobs and flesh rockets in your game doesn’t mean your game will come into its own, but it certainly helps. It really boils down to this: copious amounts of sexual anatomy > gameplay.
The dongs don’t factor into the gameplay at all, and are merely there because developer Daniel Steger learned the lessons of XBLIG a little too well. You’ll remember Mount Your Friends as the game where penises swing freely like the pendulum on a grandfather clock. They have almost nothing in common with each-other, except they’re designed with multiplayer in mind. Recently, a couple of my favorite Xbox Live Indie Games made the jump to Steam.