It`s just sheer greed.
Have and love your partner and make love with him/ her, too!
If to eat it, you won't have it anymore. Similar to a new car in that once it's driven off the lot, it's considered used.
Bisexuality-choose one and get off the fence!
Obviously if you Eat the Cake you don't have it Any more. :)
This saying never made sense to me. What's the point of having cake if you aren't gonna eat it?
If you eat the cake, you no longer have it. If you spend your money, you are broke. Etc.
Capitalist euphemism for saving your own and stealing somebody else's.