Urologist Dr Brian Steixner revealed he treated a patient who conceived after having sex with her partner.
She had a rare condition called ‘cloacal malformation’ which affects one in 50,000 people.
It happens when the rectum, vagina and urethra fail to separate into three tubes and bodily fluids drain into one channel.
The woman had an operation when she was younger to fix the problem – but it went wrong and left a tiny hole connecting her womb to the rectum.
She was left shocked after becoming pregnant and admitted her anal escapades to Dr Steixner.
He said: “We knew about her condition, and we had followed her for a decade.
“After doing a whole bunch of X-rays, we determined that she got pregnant from having anal sex.”