It’s a little hard to swallow, but after reading the case study published in the British Journal of Obstetrics and Gynaecology in 1988 (reprinted on PubMed website), you’ll probably agree:
A woman can become pregnant by fellatio (oral sex).
As the case report, Oral conception. Impregnation via the proximal gastrointestinal tract in a patient with an aplastic distal vagina, describes:
The patient was a 15-year-old girl employed in a local bar. She was admitted to hospital after a knife fight involving her, a former lover and a new boyfriend. Who stabbed whom was not quite clear but all three participants in the small war were admitted with knife injuries.
278 days later, the girl is admitted again to the hospital, this time complaining about abdominal pain. After an abdominal examination, the doctors concluded the woman was pregnant and in labor. The baby was delivered by c-section.
After talking further with the girl, and from their experience during the delivery, the doctors reached the opinion that the girl likely became pregnant after preforming oral sex on her boyfriend–shortly before the knife fight that brought her into the hospital nine months ago.
Why this silly conclusion? Due to one fact I’ve not mentioned. Again, verbatim from the report:
Inspection of the vulva showed no vagina, only a shallow skin dimple was present below the external urethral meatus and between the labia minora.
More simply, the woman did not have a vagina. Physiologically, she was unable to conceive through normal intercourse. The most plausible explanation for her pregnancy was that the spermatozoa reached the ovum va via the wounds she sustained during the knife fight nine months earlier. Again, from the report:
A plausible explanation for this pregnancy is that spermatozoa gained access to the reproductive organs via the injured gastrointestinal tract…It is likely that the patient became pregnant with her first or nearly first ovulation otherwise one would expect that inspissated blood in the uterus and salpinges would have made fertilization difficult. The fact that the son resembled the father excludes an even more miraculous conception.”