[a_t48]

Receptive PIV sex has 2% transmission rate, PIA is 20%. Cis men don't have a vagina, so...

[bobthepanda]

To further elaborate, the anal mucous membrane is thinner than that of the vagina, so it’s easier for HIV to transmit that way.

[t-writescode]

There's also a chance that the countries they were able to / encouraged to test in are quite hostile to LGBTQ+ people

[saagarjha]

This is mentioned in the article.

[ProfessorLayton]

Your numbers are way, way off [1].

Receptive vaginal sex: 0.08% (1 transmission per 1,250 exposures)

Insertive vaginal sex: 0.04% (1 transmission per 2,500 exposures)

Receptive anal sex: 1.4% (1 transmission per 71 exposures.)

Insertive anal sex: 0.11% (1 transmission per 909 exposures)

[1] https://stanfordhealthcare.org/medical-conditions/sexual-and...

[a_t48]

Ah, I didn't read carefully - https://stanfordhealthcare.org/medical-conditions/sexual-and.... is my source, this was for acute infections. Regardless, it's still more than an order of magnitude of difference. Sadly too late to edit.

[perching_aix]

could you undo the abbreviations please?

[dhaugshs]

Penis in vagina. It's a specification. It's like "birthing parent", to be clear what hardware is being used.

Given that HIV infection rates are very variable (over an order of magnitude, sometimes two) by subpopulation, clarifications detailing what hardware is doing what are very necessary.

[IshKebab]

We already have words for that: anal/vaginal sex.

[a_t48]

Yeah you’re right, I’m not sure why I wrote it that way.