A woman has worn her Fitbit monitor during sex and published the results online in the name of science.
The resulting graph, stretching over eight minutes and 59 seconds of activity, records the effects of different positions and climax.
The monitor recorded an average of 109 beats per minute (bpm), which is in the “fat burning range”, peaking during at 123bpm the woman’s first orgasm.
Noveltysin, who described herself as a “fit lady” with a resting heart rate of 60bpm, said her heartbeat was slower than during exercise at the gym.
The graph has so far been viewed more than 1.7 million times on Imgur, starting a lengthy analysis in the comments below.
“Everyone focuses on the time,” noveltysin wrote on Reddit. “I lose track of it. Time stops. I'm happy.”
Much of the response seems to have been positive but the woman said a “bunch of strange dudes” had questioned her orgasm, which came before her boyfriend’s.
Several people pledged to carry out the experiment themselves with their partners and post the findings online.
According to the NHS, both women and men’s heart rate increases towards orgasm as breathing gets quicker and heavier.
But the health service debunked claims that sex was a better work-out than a brisk walk following a study in 2013, saying that “sex did not appear to be on the same level as 30 minutes of moderate exercise on a treadmill” and was not recommended as a replacement for other forms of exercise.
Join our new commenting forum
Join thought-provoking conversations, follow other Independent readers and see their replies