Did you know that you can make CP soap with beer? Yes, you can. Basically, you replace the water in your recipe with beer. Now in this Beer Soap recipe from Soap Making Essentials it asks for flat beer which sounds like you can add any brand you wish. So if your male companion had a party with leftover (flat beer) go ahead and use it for this recipe.
If you would like to learn more about taking soap with alternative liquids such as beer, coffee and juice, I would recommend checking out The Nova Studio because they are now offering a class in this very subject.