Selfless Love - Does it exist ??

Oxford dictionary describes "selfless" as "not interested in one's self". Nowadays, people try to outdo each other by doing so called "selfless" or "charitable" acts. Someone said, "Charity is not giving a bone to a dog; it is giving a bone to a dog when you are as hungry as the dog" ..

The most often quoted example of selfless love is that of a mother's love to her kid(s). Poets,philosophers,artists - you name them - they have used reams of paper and gallons of ink to illustrate this selfless love. But, is mother's love actually a selfless love ?? For the sake of reasoning, let us assume a scenario wherein a mother,who is from a poor family, had given away her share of food to ensure that her child does not go hungry.The question to be asked is , would she have done the same if the child in question did not happen to be "her" child ??

Given this apparent contradiction, one can go to the next level and say that selfless love involves deeds between strangers without any benefit for the doer. I may not be too off the mark by presuming that these kind of acts are driven by the doer's sense of sympathy or empathy.However, if he acts to satisfy "his" sense of sympathy or empathy (or whatever it is), knowingly or unknowingly, can it be termed as "selflessness"?

Hence, does "selfless love" exist in its purest sense or is it just only an oxymoron ??