Good news! Heterosexual couples were recruited for this research!
"The bacterial composition of our genital microbiome is as unique as we are, and it's transferred during sex, according to new research. Just like a fingerprint, the so-called "sexome" may help identify sexual offenders, even in cases where a condom is used. ...
Whether the men were circumcised, whether pubic hair was shaved or intact, whether couples engaged in oral sex or used a lubricant, and whether a condom was used – none of these factors had a statistically significant impact on the microbial diversity of the sexome. Interestingly, in terms of condom use, the researchers found that the majority of microbial transfer occurred from the female to the male. ..."
"... This new research presents that the sexome not only confirms intercourse taking place but also leaves behind ‘trace’ or ‘transfer’ samples unique to a person. ...
Participants in ongoing sexual relationships (heterosexual) were recruited for the study and initial samples taken during periods of abstinence provided researchers with a snapshot of the DNA associated with healthy bacterial communities surrounding their genitals.
The couples then had sex and took a second series of samples in the hours following intercourse.
When comparing the before and after samples, researchers could see bacterial DNA signatures transferred between partners. ..."
From the highlights and abstract:
"Highlights
• Transfer of unique and non-unique bacterial taxa during intercourse was observed
• Lactobacillus spp. contributed to the most female to male sexome transfer
• Despite the use of a condom during intercourse, transfer of the sexome was still observed
• Condom/lube use, oral intercourse, circumcision/pubic hair: no impact on microbial diversity
Summary
In forensic science, detecting transfers of physical and biological material is critical for establishing evidence of criminal involvement.
Unique bacterial signatures from the reproductive system transfer during unprotected penetrative intercourse offer a novel tool for criminal investigation. Here, we demonstrate this transfer using full-length 16S rRNA gene sequencing and discuss the impact of barrier contraceptives. These microbial signatures can potentially aid in sexual assault casework for perpetrator identification when human male DNA is absent."
Unique DNA of 'sexome' could help solve sex crimes (original news release)
Graphical abstract
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