Actually the Gemarah ponders this question.
??? ??? ??? .. ???? ??? .. ???? ???? ?????
So we do Ratzon HaShem by marrying. For incentive he made them ??? ??? ??? ???? because ??? ??? ??? ?????.
It’s not me, it’s a medrash. ?? ??? ??? ???? ?? ???, ??? ??? ?????? ??? ?????. If you ever wonder, why the natural urge (- drive), what’s it purpose in this world. Of course it’s one of the biggest nosyonos of a man, but HaShem wouldn’t have created it JUST for tempting and testing a man. The answer is, without it man would not get married. Period. It’s not worth it financially, spiritually and physically. Why bother? So HaShem made this great miracle of attraction to set things in motion. Think about it – it’s a glue created by miracle. ???? ???? ???. Chazal in times of Anshei K’neses Hagdolah came to realize this importance, when they tried to do away with this greatest yetzer.
Nowadays, the selfish people of the decaying society grab the urge but throw away the commitment. ???? ?? ????? ???? ?? ????, they go after all lusts (natural and unnatural) but don’t marry. Or marry selfishly and divorce when initial attraction wears. SAD! Chazal say that Yaakov Avinu had initially wanted to divorce Leah (for his Holy reasons), so HaShem hurriedly sent children her way. Yaakov Avinu then said “How can I send away the Mother of these?”. He worked it out – eventually she stayed as the ???? ????. How differently than today’s selfish ones. WE HAVE A LOT TO LEARN!