In over 25 years in the lifestyle we have only experienced on couple that we knew (new to our group) that contracted but did not affect anyone in our circle a STD.
They (she) contracted this while participating in their mutual kink of stranger dogging. Public sexual favors with random (often multiple) strangers at bars etc. At one point they included cash for sexual favors. Why I do not know. They frequented bars/lounges mostly at hotels, restaurants, beach/lake areas. And the embarrassment of dealing with health officials and not being able to provide names of those that they might of contaminated.
They joined our group and attended a couple of parties but when I was told (by them) of their situation and how they believe they contracted the STD I told them they could not continue to attend our gatherings. They understood and I appreciated their coming forward and honesty. They both had it, medical attention and eventually cleared (so they expected). They both kind of lost their train of thought in the excitement of the activity they both enjoyed. It got very out of hand/control. The act of adding money to their activity excited them but also spun them out of control (my opinion). We lost contact with them so not sure
We notified those that were at both of the two gatherings that they attended but the couple stated they did not play with anyone just between themselves in the open room. And those attending that I contacted confirmed they had no contact. It put a dark cloud of concern in our group for a couple of months but everything went back to normal shortly after.
generally speaking the lifestyle (aside of HPV) has always been a cautious activity with transition of sexual diseases kept at a very low/no experience. Our experience with others personally and within group/party attendees has been more of a reaction to various condoms, toys, lubes, fluids etc reaction in the form of rash, chemical imbalance (vaginal) etc from mostly newbies that didn’t know they would react to that material. And this was very few and far between.
HPV is something that is fairly common with humans and can and has been contracted in couples regardless of their sexual activities in strictly monogamous exclusive couples.