No, Always means NO.
You can say NO at any time when involved in swinging activity. The other person or people must stop whatever they are doing or they will be commiting a Serious Sexual Assault.
Only do what YOU want to do.
Do not attend any swinging event as a ticket. Never do anything that does not appeal to you or give you sexual satisfaction. You are involved in the lifestyle for your own fun, not just to give others fun.
Only play with people you are attracted to.
Only get involved in any sexual situation if you are attracted to the other person/people. You are supposed to enjoy yourself.