Is opposite attraction (man to woman or rich to poor etc) accelerating the longevity of human being?how?

Yes it is.

i dont see how human longevity can be accelerated

it is fixed 

but love,needs,passion,expectation  makes it easier to go through life

As far as this attraction is Positive, it will generate productive results.

When this become a FATAL attraction (cause of distractions) then it is not good either for the company nor to the society.