Sex Play Parties

Sex-positive events (where sex will happen) are often not regulated or insured (other than possibly under any existing Public Liability cover for the venue), so it is entirely up to you to carry out due-diligence before booking.

My strong advice is get testimonials from past attendees and ask questions of the organiser to establish:

• That at least one of the facilitators or assistants will be available (not playing) at any one time and so will be available to assist you in an emergency
• What the procedure is should you need support at the event
• That assistants and other attendees have been personally vetted and what that entails
• What kind of accountability exists between attendees, if any (for example the PAL system which requires you to have a buddy there)
• How long the facilitator has been running such events
• Whether attendees have to sign up to a code of conduct/ethics
• Whether penetration is permitted (I am aware of at least one in London where it is not)

Ideally, this stuff will already be answered in the description of the event somewhere but sometimes gets overlooked. Don't be afraid to ask - you will gain respect and trust.

Over and above those questions, ask anything you need to know so you turn up feeling sexy, relaxed and confident such as dress code and the structure, if any. A bit of excited anxiety actually helps most people but not so that you feel unsure whether you should be going. 

I also suggest reading this this sex party tips article at Vice, if you are a beginner.