I don't think anyone has mentioned the context of the Hacker Purity Test. Back in the 80s, the "Purity Test" was a well-known thing on Usenet, a long list of sexual activities, drugs, and so forth. By checking off which things you had done, you could get your purity score. (This test made for a lot of interesting discussions with friends.) The Hacker Purity Test is a humorous parody of the original Purity Test. Its humor comes from replacing wild sex acts with super-nerdy activities, while keeping the form and style of the original test.