This is a fantastic guide... though upon reading through this guide, I've come to realize (*spoiler warning ahead*) that only half of the stat choices (Speed/Knowledge, Speed/Willpower, or Knowledge/Charm) are able to achieve a good ending with neither a forced bad end (that the player can, thankfully, bypass their second time around after being sent back to the prior checkpoint) nor a forced sex scene. Speed/Charm can win without a bad end, but you're required to go through either the bartender's or the squirrels' sex scene; any stat choice that includes Willpower but not Speed will necessarily require taking at least one bad end.
I kinda wish that there was at least one perfect route for each possible Willy build.
Also, the "The Sluttiest Tool in the Box" ending is a bit unusual in that it's the only bad ending that requires the player to experience and then bypass yet /another/ prior bad ending in order to get.