The long answer is, stay well away from those places.
The girl who wanted to take your friend some other place probably didn't want to offer him sex, but some other place is just that, only that the champaigne is even more expensive there. The business concept of these places is that almost every man will at least at one point in his life walk in out of curiosity, most probably half drunk with some stag mates and a need to show off. Unless he's a complete massochist, he will never come back. Therefore the goal is to fleece him as much as possible while he's there. If he's sober, he'll be out in under 10 minutes.
The sort of strip club that you may have seen in the US and where there's a lot of emphasis on show and glamour and where you could safely take your better half if she's tolerant-minded is specifically called an American-style Strip Club or an American Strip Club. Anything else isn't that.
But yeah, moral of the story: dodgy places they are.
"Would you have sex with me for a million CHF?" I asked.
"Sure honey bun" she replied.
"How about having sex with me for one CHF then?" I asked again.
"Hey.... what do you think I am...a hooker?" she replied and slapped my face.
"Well...we already established that, now we are just negotiating the price."
Anyway....one of my favourite songs on this topic:
"Two hundred francs for sanctuary and she led me by the hand,
To a room of dancing shadows where all the heartache disappears
And from glowing tongues of candles I heard her whisper in my ear.
'J'entend ton coeur',........"
''.....but I'll tell you what's not cool.....killing strippers. Strippers are people too. Naked people who may be willing to pleasure you for a price you negotiate later behind the curtain of a VIP room. Besides, there's no reason to kill them, coz most of them are already dead inside.....'' - Peter Griffin
cheers
SC
The story addresses the humanity of all the characters. it is sad that people sell their bodies this way, it is inexcusable when coercion is used, or when minors are involved.
However before judging the original poster think of this:
"Human beings can withstand a week without water, two weeks without food, many years of homelessness, but not loneliness. It is the worst of all tortures, the worst of all sufferings.” Paulo Coelho
Herpes sores can be on thighs, groin, buttocks, lower belly, etc... Crabs, aka pubic lice (maybe not a "disease" per se, but disgusting anyhow) also are not held back by condom usage.
So, YES absolutely use one but do not for a moment think that "everything will be okay" is in any way a certainty.