Is love without physical attraction possible ?

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Why people are attracted towards the opposite gender ? Simple answer is love . People get attracted because of love . But what is it that generates love ? I think the ultimate factor responsible for love is eagerness for physical union .That is why none can continue a love based relationship for good without indulging in physical union . But some people ( normal in all sense)disagree . And I have failed to convince them . I need your opinions to strengthen my arguments . So please put forward your opinions .