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.
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.