Funny, I'd say my Google API keys are a way, way, way bigger secret than the fact that I sometimes watch porn. Most people do, so it's not a big surprise that I might. I wouldn't much care if people saw me naked. It's just my flesh. Everyone has a body. It's easy to find pictures of naked bodies, and pictures of mine probably wouldn't be very interesting. But my API keys, they are unique and important.
That said, for random private-ish accounts I use Chrome user profiles. Safari does not have them.
Are you American?