While this is a very interesting finding, I suspect p-hacking. https://en.wikipedia.org/wiki/Data_dredging
Imagine the awkwardness when someone tries to get funding to confirm.
Imagine the awkwardness when someone tries to get funding to confirm.
In this particular case they seem to have a clear hypothesis on why there could be a strong link between one and the other: > "Oral sex might induce maternal tolerance towards paternal antigens of the fetus".
Anyway. This doesn't mean that this is a strong study. Just pointing out that at least they seem to have a theory on why oral sex can protect against miscarriages.
"association became weaker" with a p=.21