What is the relationship between love, marriage, family and sex?

You have to understand how love is created. Love comes from a substance secreted by the brain. This substance is secreted most vigorously during sexual impulses. In other words, love is an accessory to sex. It's only love when there's sex first. Is it possible for love to exist without sex? Sex has existed for millions of years. Love is only a few thousand years old. Do you think that love can override sex with such a huge gap? This isn't a novel, this isn't a movie, this isn't a fantasy world, this is the real world, and scientifically, love without sex cannot exist. Love without sex/relationships is not called love, it is called affection, just like the elderly couple, they no longer have sex/relationships/relationships, but to maintain their relationship is not love, but affection...