Yes, trust is essential. But it happens that people do trust others they do not know. I myself have felt often that especially male subs have trusted on first sight way beyond reason.
But it can also be that the place itself has such a good reputation that it inspires trust in people, and they take a leap.
And finally, there are lots of people who want to be a little scared - or even very scared ;-)
The art is in the details I would say :-) But you have to start somewhere to learn what they are, there is always a first time, and there are always mistakes along the way. I do hope that such mistakes can be sorted, or every dom would have to be a god(dess).That's why it's good to have someone who you know understands the subtlties of your limits. Once limits start getting breached, even accidentally, trust and enjoyment could plummet.
Such experiences can be mind blowing!Even scenes without sex still require trust - at the end of the day you're still tied up and relatively powerless to a complete stranger. Just because you're not have genitals rubbed doesn't mean the act has no significance.
Some places do a lot to make people feel comfortable, like having contact persons to say hi, or evenings for newcomers alone (apart from the contacts), or women's evenings, or common safe words, or other good ideas.At the end of the day, it's another fetish, and we all have kinks we like to follow. To those of you who go to clubs for this, good on you! I don't know how you muster the courage, but congratulations on being able to.