Because IT'S SPARE CAKE. It's left over, it's nice. You're reading an awful lot into this, Swedes, and again, it's assuming a lot of things about the person baking the cake from the start. Which are most probably not true.
It's actually quite depressing that people see it this way - so far people would assume that I have food issues, am somehow jealous and staking my claim on DH (he wears a wedding ring. That'll show the bitches, surely?), and have a terrible need to nurture the World.
Whereas I have a very healthy relationship with food. i neither binge nor deny myself, and maintain a good healthy weight despite have Never Been On A Diet. I have an excellent relationship with DH, and am sufficiently Up My Own Arse for it not to occur to me that he'd so much as look at anyone else.
I'm anti-scoial and not very nurturing, tremendously happy, reasonably high-achieving and professional. Why can't you imagine that of the other hypothetical or real women under discussion. I have spare cake, or offer to make Dh's contribution as I like an excuse to bake. Why is this so freakish?