The social psychologist Eli Finkel, the director of the Relationships and Motivation Lab at Northwestern University, believes the future lies in using dyadic data, observing rather than predicting compatibility from an initial interaction. Non-conscious synchrony emerges when two people are interested in one another: within minutes, pupil dilation,

In a study of the most successful words for men to put on an online profile, ‘physically fit’ upped response rate by a whopping 96 per cent;10 in another, the number-one word for men to use on a profile was – wait for it – ‘6ft’.

One study showed 44 per cent of millennials were on Tinder for ego-boosting procrastination – more than were looking for either hook-ups or relationships.

The average person in medieval times is thought to have laid eyes on fewer than 100 people in the course of a lifetime. An attractive young woman can rack up that many matches in minutes.

With a googol of profiles to get through, 75 per cent of men say they swipe on the basis of only the first photo.

A study out of Stanford showed that a staggering 80 per cent of single straight adults had not gone on a single date or hooked up in the previous year, leading the researcher to conclude that the main utility of the apps for heterosexuals might be ‘for flirting or for browsing’.

In one study of singles on the pull in a bar, researchers observed 109 distinct ‘attraction tactics’, including offering to buy someone a drink, sucking seductively on a straw, puffing out one’s chest, and maintaining eye contact.

The matching potential of the genome is not entirely without merit: kissing is hypothesised to be subconsciously used by women to gauge the health and genetic make-up of a potential mate through saliva, as well as for eliciting arousal through the exchange of hormones.

One study showed that half of Tinder users had not gone on a single date with a match made on the app.