Do you mean an essay about risks of downloading pirated or impure (e.g., adult or malicious) content ? B) Or is this a specific book, game, or file name you want a critical analysis of? C) Or a moral/religious essay on "the impure lowering themselves" (a metaphorical descent)?
Once you clarify, I’ll write the full essay immediately.
I notice you’ve asked for an essay on the subject — a phrase that appears to be Portuguese.