Personally I have not joined Contiki cos I have not been
backpacking in Europe. I have joined a similar outfit in
Canada.
But heard from my colleague who went with Contiki in Europe, yah,
they're a bit rowdy and that's one night after much dirnking, the
guys decided to strip naked...and the gals (mostly ang mohs) were
giggling and cheering them on. And my colleague (being a girl) with
two friends have to absent themselves & retire to their
room.
I guess you can look at it both ways, you can get fun - and you are
out there, no one knows you, so why not (of course not doing the
illegal stuff) but if you find it beyond your tolerance, you can
just step away, cos it pretty free and very much up to the
individual. I suppose that chapter is one of the more 'hiong' ones,
I am sure there are other fun moments too. Personally I think its
an eye opener and a swell experience.