Just for the saftey of....someone (could be male, could be female, could be both in the case of the OP, as one of the baldies might have had a gun, and forced the other two into sex), I'd call the police. You can never tell if it's rape, as there have been cases of rape victims enjoying the sensation, but stll being forced.
I'd expect the same in return. I enjoy having sex in public. Every time me my exs did, I expect the police to show up, just because someone was being a good person, and not knowing what the hell was going on. Simple.
There doesn't really seem to be much room for constructive discussion here and threads on the subject of sexuality are typically not allowed, as such, closing.