Someone I know in Australia has bought Agony but didn't receive the unrated version of the game. If I buy a key here, send it to myself as a gift, and paste the code to him, will he be able to receive the unrated version? Would there be a better chance of it working, if I add him to friends and try to send it that way?

Usually it can work this way. However, he should use a VPN to fake his IP when adding the code. I know cases where the website (not sure if GOG does it) also checks the geolocation of the client when activating a code.

Adding him as friend won't make any difference.

Isn't using a VPN to circumvent that a big no-no?

Only time GoG checks for the location is during purchase, from the looks of it.
From my experience it does not matter either way from where you've purchased a gift code and from where the gift code is then redeemed afterwards, never had any problems in this regard. That's what the man wants you to think.
No need to worry, as a netizen it's within your every right and perfectly legal to use a VPN.

Good to know. It has been a while since I have been feeding codes for uncensored versions to my friend in Germany.

I mentioned it, because Steam and Origin have regional codes sometimes (only EU, only US ...). Here in Italy there is no way for me to buy or activate a code for American McGees Alice. All keysellers say that the code won't activate here. It is against the terms of service, when you mask your IP with the one from another country, yes. But also getting a uncensored version to Australia is too. So you're going the no-no route either way.
They won't prosecute it because of a gift code.

I once changed my IP to Bangkok, moved my Steam account there, so I could activate a f2p game which was meant only for the asian market. And all other european and US players did the same :D
It took a couple of weeks tho, you need to let some time pass before you can move accounts again.

It's stupid to block games like this for him or any other adult.

Thanks for the replies, though.

It's weird that Steam gets the unrated cuts of Agony and Succubus.

GOG has them, too. Unrated is a free add-on for Succubus. Not sure why there wasn't one for Agony. Maybe they didn't feel like taking the time to split all of the unrated things up from the base.

There was a Postal give-away that wouldn't redeem in Australia but would redeem in the UK -- all down to censorship and all based on the assumption that your IP address is an accurate indicator of which laws apply to you, which they don't for many reasons.

Usually a VPN is used to encrypt all traffic passing through the tunnel. Getting a different external IP address is just a side-effect, the same as if you used a web proxy or a SSH tunnel. There is also Tor.

The first part of your statement is not correct when you say "no need to worry."

Yes it is correct that using a VPN is legal.

However, if OP starts using a VPN in order to pull shenanigans like bypassing geoblocks for a game that GOG has geo-restricted in certain regions, then GOG will be within their legal rights to ban his account if they want to, so he does indeed have reason to worry if he starts pulling shenanigans like that.

I have no intention of using a VPN. Don't need to, anyway. How many games are blocked for GOG users in the U.S.? I can only think of one. It's a Japanese version of Horizon Zero Dawn.

The german version of Kane & Lynch is no 2, but you would not want that anyway.