And because most dating sites ask users to give consent for their data to be used for research purposes, this online courting has played out like an enormous social science experiment, recording people's moment-by-moment interactions and judgments.
The data set includes some 1.1 million interactions between users.
But beyond someone's looks, how much do any of these factors matter for mate selection?
One complication is that online daters are not making just one decision, but several in a series: First, people are swiping their way through profiles and deciding which to dismiss immediately or browse more closely.
Then comes the choice to send a person a message, or to reply to one.
And of course, the final, crucial decision, which isn't captured by these data: whether to meet the person in the real world.