In room the “naked” position is the “sex clothing” change. Otherwise if you jump into a position your clothing will change and wwn't change back unless you click the fully clothed box.
I did a bit of quick network monitoring but it looks like it's not using a fixed port, unfortunately. Here's what happened when I ran, closed and restarted achat:
while achat ran it sat on UDP port 55405 (I think)
after shutting it down and restarting, the VersionUpdater was using UDP port 58479
when achat itself was running again it used UDP port 54835, i.e. not the same one it used previously
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Conclusion: it's picking new ports every time you run it. I've no idea which range it is picking its ports from, so you could either open up everything above 1024 or try something a little more restricted like 53000-56000 and hope that that suffices.
The Support page doesn't say much about it either unfortunately, it simply says something like “allow all UDP traffic on your router”.
I often think it's a shame there's no listing at the bottom of the page showing who's online at any time – no particular reason for it I suppose, though this is the only forum I've ever been on that doesn't have this.
True, you only know it when you look at the little balloon under the name – a brighter point inside of the balloon says “is online”. I agree, it would be a nice feature.
you can only change your avatar into new things you bought in the shop after you become a premium member. either by getting a 3-day membership by A$ or paying for one. After becoming premium, you can change and only as long as the membership's duration.