We find it more amazing that people insist that condoms be used for "safe sex" and really believe they can put a cock or pussy in their mouth during foreplay and not be "exposed." Really? Cum on people. Why is it then, that we are not supposed to share toothbrushes - even with our significant others - due to the amount of exposure to that bacteria and that blood flow, which is enormous. Why do you think hookers use flavored condoms when performing oral for a customer? The pros know, that's why. Like to lick pussy? I do and I always do. Where is the protection from that for those of us who do? Under the tongue is where many emergency medical remedies are given due to just that; a significant amount of blood flow and the most readily available without using intravenous instruments.
The real deal: There is no possibility of "safe sex" unless you already know the people you're both fucking, their hygiene, health habits and lifestyle outside of swinging. Then there's those who want to make sure they get tested every few months. Really? If you did get it on with someone you shouldn't have, you're already fucked. Get it? I used to work in the medical field at the street level, with EMTs and paramedics, as well has having a few girlfriends who are nurses. They will all tell you there is no way to be totally safe. The best we can hope for is to be aware of who we're fucking, their habits, personal practices, as described above, as well as - and this is probably most significant - are they in a high risk demographic? Intravenous drug users (difficult to hide this, folks)? Traveling to South America, Africa (for instance) on a regular basis?
We have been playing in a core group of swingers who have become close friends for years now, for just this reason and we always are playing bareback. The simple fact: Even a handshake with someone can transmit the virulent diseases, because people just refuse to wash their fucking hands and then go out into public smearing their dirty habits on every door handle they touch and that exposure can result in the ready transmission of any of the diseases you care to name that can survive in an oxygen rich atmosphere for more than 24 hours - hepatitis, just to name a very common one and there are many types of just that one.
Your bottom line: Unless you know without a doubt who the person you're fucking has been fucking within the last 12 weeks, you could be fucking dozens of people. Do we have to all be great friends with every one of the people we have sex with? No, but it doesn't hurt to allow it to happen. The most safety we can provide in this lifestyle is knowing what to look for in people that we become involved with. There are no guarantees, period. But we can narrow the possibility by being observant, diligent, respectful, truthful and candid with every couple and single we encounter, period.