Is having Pampas Grass in the front garden a sign that swingers live in the house?
No. Swingers do not advertise publicly. Being a swinger I can honestly and accurately tell you that there is no symbols swingers use to identify them from non-swingers. Anything you hear to that effect is purely speculation and misinformation, or trying to spread gossip about someone, and we all know that gossip is seldom true.
That is one of those “urban myths”. Although there are several companies attempting to create and market “swinger symbols”, they typically consist of jewelry, bumper stickers, temporary tattoos, things like that. Thus far none of them have taken off. Most swingers prefer to be very discrete about their lifestyle choices, and most swingers expect their partners to be discreet as well. Someone wearing a public badge sort of defines the meaning of indiscreet. 🙂 If you are looking for companies offering these “tokens”, have a look at http://www.theswingersource.com, it is just a directory of products and services for swingers, and last time I looked, there were several there.