salam,
you have to apply some sales techniques in this and you should know an important sales technique is that to create a need, so think in that way, if he is religious you can convince him by telling the facts regarding this, if he is a realistic person you can say something like family name to carry, someone to takecare in the old age and so on and the most important fact is that a girl can convince a man very easily in some situations, atlast apply that