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Serendipity: origin, history, domains, traditions, appearances and programmability. Results Thirteen experiments were performed with eight couples three couples performed two experiments each and three single women. This article has been cited by other articles in PMC. P van Andel does not want to be acknowledged for his idea of using MRI to study coitus. The changed configuration of the bladder was caused by penile stretching of the anterior vaginal wall during intromission, plus the raising of the uterus and intercoutse increase in bladder the woman has sexual intercourse the picture as it filled. It can include kissing, touching, erotic massage and using sex toys, just to name a few options.