A US TikTok user has shocked followers with a video revealing that five years ago she became pregnant, despite never having had penetrative sex.
Before you roll your eyes at "that old chestnut", hear her out.
Samantha Lynn Isabel, now 24, says she was 19 when she noticed abdominal cramping and a late period.
Normally that would fire off serious alarm bells - but Isabel was confused, as she and her boyfriend had "fooled around" but not yet had penetrative sex.
Isabel says they grabbed a pregnancy test just to make sure.
"Takes pregnancy test and thinks it will be negative," she wrote in the caption in the TikTok. "Me thinking it's a false positive and takes six more tests."
She eventually went to a doctor for more testing, who informed her she was five weeks pregnant - "through foreplay".
The video explaining the saga has been viewed more than 1.4 million times and Isabel says her family have since lovingly called her 'Virgin Mary'. She is now mother to five-year-old son Bently, and the couple had another son Theo last year, according to Buzzfeed - although he was conceived the old fashioned way.
It's a good warning to many of us to always use protection, even if full penetrative sex isn't on the cards. Gynaecologist and obstetrician Jennifer Lincoln told Buzzfeed such a pregnancy is rare, but very much a possibility.
"Sperm has to get into a vagina in order for pregnancy to happen," Dr Lincoln said. "It doesn't matter what puts it there - whether it's a penis, finger, turkey baster, you name it - but once it's there, it can travel through the cervix, into the uterus and rendezvous with an egg in the fallopian tube and fertilise it.
"With fingering, if some semen is on the fingers that touch or enter a vagina, the amount is likely lower than with penetrative sex."