Lyric discussion by hiddenaway4ever 

As always I look at lyrics in a poetic sense; so this is my analysis of the symbolisms.

I think that the monkey is a symbol for the basic mamalian self and the hedonistic desires. The shocking of the monkey represents multiple things: first the shock is the semi-literal sence of electricution (semi-literal, meaning that the humanity hates and hurts itself for taking part in hedonistic behaviors). Another meaning for shock is for the surprise that the "monkey" feels when it finds that it's needs are not being met in the culture.

Hedonism: an ethical system that evaluates the pursuit of pleasure as the highest good.

so technically the idea that the song is about masterbation fits into the symbalism.

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