Actually it goes up in register, but I wan't sure if "register" would fit in the topic line.

You get the idea, though. It seems that every successive game with Mario in it features a regressive pubescent Mario voice. The kicker was Mario Golf for Gamecube. We finally got around to picking this up, and I couldn't believe how over-the-top feminine/gay Mario had become. His voice just keeps getting higher and higher!
I suppose at some point, Mario's polygonal testes will have retracted so far that his voice is no longer audible to anyone but dogs and Superman.

Anyone have an idea as to why this is so? Is Nintendo catering to the jap fetish crowd and their effeminate models of masculinity? Did they decide to "be hip" and make Mario gay (it's all the rage!)? Why does his voice keep going higher?