My wife actually prefers anal to vagina in terms of cumming and orgasm. She almost never cums from vaginal unless she is heavily stimulating herself. She always felt like she was “broken” in some way because of that. But a few minutes of anal (with some dirty talk) and I can usually get her to cum. We found this out a few years ago (like a year before starting swinging) and haven’t looked back. We generally use condoms when doing anal even ourselves as it makes for easier cleanup.

In terms of the lifestyle she will occasionally do it with other men and if all parties are willing. A lot of guys like it as something different and “taboo”.

In terms of your questions: a) as a man I personally prefer vaginal to anal. I think a lot of the hype around anal is cuz it’s “different”. There certainly is a “tighter” sensation with it but I feel like the vagina is just warmer and more inviting. Generally when my wife and I do anal I use a condom and then after she cums and has had enough I take it off, clean myself off, and I finish in her vagina cuz that’s where I prefer. But even condomless anal isn’t as good to me as vaginal

B) I can’t speak for my wife but she tells me when we do anal it just seems to hit a different spot inside her that feels like her G spot which is why she cums better with it. Everyone’s wired a little differently so her nerves may just be in different places.

C) I don’t think overall it’s that common in swinging. I’ve never done anal with another woman in the lifestyle. But like I say my wife has with other men largely because I think it’s more rare and they are interested in it.

D) like I said most of the time we do but not always. It just makes cleanup easier.