Very few of the questions are offending, but if you feel in some point you don't want to answer to any more questions, just navigate back to your safe home page and forget this test. But then you can't be sure how pure you actually are.
When you select to submit the test, your answer will be saved in order to calculate some statistics. Your name or login account won't be saved. If you're still in doubt, use some HTTP proxy server to hide your real identity.