While I can understand how other people can have the ability to trust someone they just met to not take (undue ) advantage of their bound body, it's something I personally wouldn't be comfortable with. Trust is really important, otherwise it's not as easy to relax into the scene. 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.

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.

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.