I have to agree that there's nothing unusual about this at all. Twice last year I was away for several nights with my team on a team building course type thing and I could have easily come home each night. It was only about 45 minutes away by train, etc. But that would have been unheard of and I would have missed out on all sorts of things. In my company, it's very common here to stay over in a hotel with colleagues, even if you're near home.
And for the record, I think Liz is absolutely right about having to be flexible with different customs and ways of doing things. It's harder to try and understand the customs when you aren't yet in this country, but it's good practice to start realising you aren't going to know about stuff like this...and you have to trust that your partner isn't going to betray you from the start. Especially since in the beginning, you'll likely be very dependent on him until you do start understanding and figuring things out. If it's uncomfortable to do that now, it's going to be 10 times worse when you do get here.
Also, you have to remember that every company has it's own little culture, aside from the culture of the country!