I have a very old adult (e.g. boobs and stuff) arcade game (think Delphi 7/DirectX 8 age), that currently is backported to Droid. Can the game be published to Android Market? Are there any age restrictions?
Android Market has a very restrictive adult category. So you probably can't. But, you can publish your application on alternative markets that allow adult content.
Obviously you can't. You'll have to host it on your own.
See developer content-policy.