My wife and I recently wrote on singleness in With One Voice. Our interest in the topic was rekindled with Pastor John Piper preaching a series of messages on marriage (with his last two sermons being more related to singleness). He also pointed to a provocative, exegetical study by Barry Danyluk. All of this got us thinking about whether there might be different kinds of adult single Christians in the church today. The following graph (I am an engineer) is the fruit of our musings. We welcome any and all feedback on it, as we recognize that any one-page graph necessarily involved making a finite number of categories.