I am glad you resolved this OP!
Its a really bad idea the friends had, especially in a work context. Just totally crass and really ugly.
But the good thing is that they did ask. And this means both that (i) they respect you and (ii) they respect your OH and were using you to sound out how he might feel about it.
No-one should feel awkward about objecting to this kind of thing. Its genuinely horrifying that its still legal to publicly surprise people with (often degrading) sexual "entertainment".
Hardly anyone likes it, its a small minority, but they thrive because they know most people lack the confidence to speak up, or are worried about the reaction they might get.
It can still happen, but apparently licensing laws are now stricter about this kind of thing and it can be more hassle than its worth for premises to allow it (in scotland anyway).
Your husband will be really grateful to you, for putting your foot down OP!
There are plenty of videos on youtube (and less salubrious sites) of this kind of thing at birthday parties etc and the men are usually completely humiliated.
They can expect to have their trouser and pans whipped down, so everything on show to friends and family - lovely, have his bottom whipped and have cream or oil poured over him. Not to mention being led around like a dog, with his own belt as a leash. Like, ugh.
Of course, dozens of people (inc randoms) can then video this on their phones and its straight onto the net for all eternity.
Just what you want your boss / clients / children etc to see.