The simplest way to fit in in a play party is to behave politely. There will be people right in front of you who are doing very sexual things. They are doing them for _their_ pleasure, not for yours. Stay away from the action unless invited to participate– and a glance in your direction does not constitute an invitation.
Respect safety and play boundaries. SSC, RACK, PRICK. Have a sense of humour. Leave your drama at home. We are ‘neutral territory’ and expect it to be respected as such