Have a look at Anderson Power Poles. I use the 15/30/45 amp versions extensively for various 12VDC applications. They have no exposed conductors, and they were designed from the outset for DC power connection. They're relatively "idiot-proof", meaning they can't be connected with wrong polarity, yet they're genderless.
Power Poles come in bigger sizes for higher currents, including 120amp, 175amp, and 350 amp versions.