Cheap Sex is more useful, interesting, and informative than many books on the same or adjacent topics, and it pairs nicely with Date-onomics. The books can be read as differing reactions to similar social phenomenon on the ground, with the latter having a more left-wing tilt that nonetheless describes how people should pragmatically react to current conditions, while the former has a more right-wing tilt that nonetheless describes how these conditions came to be. We live in an age in which everyone is outraged or offended by something; when you find something that outrages or offends you, leave a note in the comments. You may find that cathartic.

Although neither book makes this point, I think they’re part of the continuing social reaction to the Industrial Revolution. “What,” you might be thinking, “does the Industrial Revolution have to do with contemporary books on love, marriage, and dating?” Prior to the Industrial Revolution, most societies were (relatively) stable most of the time, at least for the duration of a human life; the technological and social conditions one’s parents faced were likely the same an individual would face and the same that individual’s children would face. Cultural and technological change was of course real for much of human history, but it was also relatively slow, allowing people to acclimate to it over generations instead of years or decades.

Since the Industrial Revolution, though, we’ve seen technologies that radically and repeatedly reshape the technological and social worlds. This leads to periodic moral panics, especially but not exclusively around sexuality and religion, in part because we never get a chance to get used to new technologies.

(It’s hard to think of a single book that summarizes the Industrial Revolution; Joel Mokyr has some, Deidre McCloskey has others).

Today, we’re still grappling with the reshaping of society due to pretty reliable contraception. In some ways we’ve had pretty reliable contraception for a very long time (since the ’60s), but in the view of human history, or even human history since the 1750s, we’ve had it a very short time. We’ve spent pretty much the entirety of human evolution without pretty reliable contraception, and that’s shaped our minds, our bodies, our societies, and our practices. And it’s still reshaping all of those things, without most of us stopping to think about what it all means to look at these things in the course of a very wide and long history.

That’s part of what Regnerus is doing. The present moment is the product of a whole lot of past, most of which most of us don’t think about most of the time. But a lot of our current conflicts come from past conflicts that we don’t fully understand. And he’s pointing to that history, when he writes in subheaders about “The transformation of intimacy.” Or when he writes about the “obsession of romance among many, and yet stability seems increasingly elusive.” At the same time, “the ramifications of cheaper sex are just beginning to unfold on a panoramic scale.”

No wonder people are confused. For most of human history, cultural notions around sexuality have been pretty stable. Now they’re incredibly unstable and we’re all making things up as we go along and responding to technologies that have unpredictable consequences.

Regnerus may not be right about many of his conclusions, but he is thinking differently and also not stupidly, which is valuable in and of itself.

I’m also not sure how much you can trust the book’s conclusions, as many are drawn from “nationally representative survey data” as well as “in-person interviews,” the problem being that people notoriously lie in surveys, especially about sensitive subjects, and the same biases occur in in-person interviews. Those weaknesses are part of the reason why books like A Billion Wicked Thoughts, Dataclysm, and Everybody Lies are so interesting: rather than relying on the surveys in which everybody lies, they look at revealed preferences in the form of data from the Internet (and online dating itself).

Cheap Sex itself is written competently but not beautifully. You will not stop to admire individual sentences, and that’s why I’ve not quoted much from it so far. Read it for the knowledge, not the prose. Like many academic books (this one is published by Oxford) it has its share of “You don’t say?” statements, like, “When it comes to relational happiness, then, sexual frequency is neither necessary nor sufficient, but it is certainly a net positive for most.” “A net positive:” really? I’m shocked! I would never have guessed.

But it also has its moments of humor, as when an interviewee discusses at length his own romantic dilemmas and then Regnerus writes, “After we turned off the microphone at the end of the interview, Brent asked if we though the and Betsy should break up. (We declined to respond).”

There are also moments I’m still mulling and don’t yet understand:

Meant to be a “haven in a heartless world,” as the late social critic Christopher Lasch described it, marriage is fast becoming a contest, another tenuous social arena in competition with the economic marketplace (for our limited time and energy) and the remarriage market (for second chances and variety).

A “haven in a heartless world:” Regnerus implies here and elsewhere in the book that maybe there isn’t such a place. I’m not arguing that he’s right. But I don’t see a compelling reason he isn’t.