A fetish is when we need something special to turn us on. It can be a thing, can be an imagination, or a sexual activity. For example that special thought we think while we are masturbating. It is what makes us really horny, not just horny. There are all kind of fetishes out there. More than we can imagine.
Some fetishes will contain actual items, such as high heels. Some fetishes will be about acts, for example acting like a prostitute, or house keeper, while having sex. Some "hard core" fetishes might contain both actual items and acting, like wearing a diaper and acting like a baby. I don't want to talk hard core fetishes, like, domination, pain, plastic, golden shower or water sport. They are a different category and have nothing to do with swinging.
Some men,
swinger and non swinger have fetishes and don't even know it. Are you a breast lover? That is a fetish. A nice long female legs turn you on? Do you like them in pantyhose? What about shaved and pierced genitals? That too is a fetish. Don't run from them, they are what turn you on.
Voyeurism is the most popular fetish. People love to watch and be watched while having sex. Also lot of people swing because they love to watch their spouse in sexual activity with others. This is why they swing. This is turn them on. Is this swinging practice consider as fetish? I believe so.
Other popular fetish that swingers an non swingers practice the language. Lot of people enjoy saying things while having sex, because it turn them on. Some people (usually women) can't have orgasm with out dirty word. For example a lot of swingers women like to "order" their sex partner: "Fuck me harder whit that hard big cock of yours!"
She get turned up by just thinking about big hard cock (even if her sex partner's cock is not that big) and if somebody watches it, that person probably will get horny too.
It is interesting how the swingers men and women deal with fetishes. For example the average swingers men has foot, crotch less pantyhose, garden belt and shaved pussy, fetish.
Women, swingers and non swingers obsessed about shoes and spend a lot of money on shoes.
Also women often fantasizing with big cock and multiply sex partners. Is this fetish? You decide!
A lot of people, swingers and non swingers love fetishes. Probably they don’t even know what they love is fetish. They love it and they don't want to give it up and they should not. If they and their sex partner enjoy it, just because it is fetish it is not a crime!