This is quite a mystery. My first thought is psychoactive drugs or chemicals but there is no way it would affect all of them so similarly and abruptly at the same time.
It reminded me of a little historic tidbit:
In the Victorian era, “Female Hysteria” was considered a real mental illness. Almost a fourth of women were believed to have it. One symptom was “causing trouble”.
The “cure” was medical stimulation of the pelvis until “hysterical release” (orgasm). The physicians got tired of having their hands occupied for hours and the first vibrators were introduced as medical devices.
I see I’m not the only one who went to the Trojan ‘Twister’ site!