Are pineapple flags a sign for swingers?

Answer 1

In some cultures, a pineapple flag or sign means "Welcome."

The swinger community doesn't have any kind of sign or symbol that is universially accepted. Though there are some attemps to create one, most swingers don't want to wear something that outs them. There are a few sites that claim they sell one, but their acceptance and even recognition is very low.

My favorite one, as a swinger, is a pendant with Love, Trust, Communication engraved on it. Swingers who play seperately from their spouse (those in true open marriages) use Love, Trust, Openness instead.

The key to having a symbol is being able to deny you are aware of it having any special meaning since most of us have kids and parents we don't want to advertise our sexual hobbies to.

Answer 2

No, it is a symbol for welcome.