God, well i only got a legit copy of Gmod a couple of years ago (up until then i played on some bullshit cracked copy, which i got rid of as soon as i bought it). At first I played Gmod for the stupidity, such as strapping balloons to ragdolls and attaching thrusters to nukes, spawning a shit ton of manhacks and running around etc. Hell, at this point i didn't even know how to use lights, the weld and no-collide tools etc.
It was around this time that i stumbled upon Facepunch and subsequently the nude Gmod posing thread. Thought it was pretty neat, so then I grabbed the game as quick as possible after being invited here (by here, i mean the old lefora form of Ero) by Rasti and then got down to business. I think i started with the nude Lamaar thing, the really shitty nude Zoey we had back then and a pack of low-res sextoys :P
That sums it up really :D