In a previous thread, Cill posted a video with a speaker who says that women keep the DNA of semen from their previous partners in their bloodstream. I’d pointed out then that this exact occurance (known as telegony) has not been observed in human women…but in fruit flies.
Now, there has been another study done about microchimerism in human women aka the presence of a few random Y chromosomes in their bloodstream…anywhere from 0 – 20.7 male cells per 100,000 female cells. However, this was only found in 21% overall of the 120 participants. All of these women had a sexual history, but not all had a history involving a known pregnancy. (As an estimated 10-15% of potential pregnancies end in a miscarriage before week 8, having an unknown pregnancy is not uncommon.)
While it is entirely possible these women had kept DNA from previous sexual partners in their bodies, there are other more likely explanations to explain these few Y chromosomes. It could have been due to a natural miscarriage of a male fetus that went unnoticed, a “vanished” male twin, or leftover traces from an older brother that crossed the placenta. Interestingly, the highest amount of microchimerism was found in women who’d had abortions.
23 women who’d had abortions = 57%
26 women only birthed daughters = 8%
23 women had miscarriages = 22%
48 women had no known pregnancy = 10%
Due to the significantly higher amount of women who’d had been pregnant but didn’t give birth having microchimerism, it’s safe to assume that the fetuses would likely have been male. Of course, it *is* possible that some of these women did retain a bit of their previous lovers DNA…but then why wouldn’t it have shown up in the majority? Maybe conditions have to be exactly right, or a minority of women are just predisposed to being “DNA receptive”? We don’t know yet, but it’s important to not rely on pseudoscience, even if it “backs up” claims that we think are true.
Hopefully a reverse study will be done to see if men who’d performed oral sex on a previous partner carried some of her DNA in his own bloodstream. It’d be more difficult to test for given that men already have an X chromosome, but could be done, just as a follow-up study could test the 21% of women to see if the male DNA actually matched their previous partners or if it were “new” and therefore indicative of a potential son. Each of these would certainly take a huge amount of work though…
Here’s the study link for people who want to read it themselves: