In the sample of healthy young Belgian women (half of whom were vaginally orgasmic), history of vaginal orgasm (triggered solely by penile-vaginal intercourse) was diagnosable at far better than chance level (81.25% correct, Fisher’s Exact Test P < 0.05) by appropriately trained sexologists
So they set up a study where they watched women walk around and tried to guess which ones had vaginal orgasms. AND GOT PAID FOR IT!!!!!
What a brilliant scam.