Condoms are a problem for me. I have a thicker than average cock, though average length. Over the years, I've tried various condoms but found out that thinner condoms tended to break. Yes, I was careful, yet even so they broke. This being bad of course, I ended up settling on thicker condoms to prevent this. Will I use them? Sure. But, I dislike them, and it most definitely affects feeling. So, I prefer bareback, but I've only barebacked with my wife (well, since we got married ).
My wife prefers no condoms, and prefers a man cumming inside of her. She has a long term (years) play partner with whom she goes bareback. With new partners, it's always been condoms. She is, far more than any other woman I've ever been with, much more turned on by a naked cock than one with a condom. For basically any other woman I've been with, it hasn't really mattered to them from a feeling standpoint. For my wife though, it's far more erotic and sexually satisfying for her to go bareback.
To the STD issue and statistics; sure it would stand to reason that swingers would have more STDs. But, without real studies we don't know. There's supposition both ways. Of course, bacteria and viruses don't care about supposition or statistics. Yes, there are risks, and any responsible adult needs to take that into account. A fun related note; I've recently had a health issue that could have potentially been caused by an STD, though a somewhat low chance. Other possibilities weren't providing an answer, and the doctor was puzzled. So, I asked for an STD test, checking off a number of STDs for which I wanted to be checked. My doctor knows I've been married for quite a long while now, so he was perplexed. I could see him begin to form the question on his lips, but he never brought himself to ask. It was hard not to smile Everything came back clean thankfully.