The purpose of sex may seem obvious, but it has perplexed and intrigued a variety of great minds for millennia.
How to deal with a world that is going a bit off-kilter? Some classic texts can give a few pointers.
In their coverage of Meghan and Harry, the media are focusing on all of the wrong things. Thankfully, Russian novelist Leo Tolstoy had sharp insights about marriage that still resonate today.
Russian revolutionary Nadezhda Krupskaya, like other leading women in the new Stalin-led state, was marginalised. But in her case, because she was Lenin's widow.