Love is caused by hormones. Men and women had a good impression on each other at first, and then they became boyfriend and girlfriend. At this time, it is hormones that maintain their feelings. At this point, their IQ dropped dramatically. They are the best people in the world in each other's eyes.

However, this degree is not enough. Love can only be regarded as a kind of kindness. Love needs time as a guarantee. After all, I may be attracted by some characteristics of the other person at first, but after a long time, I get to know each other more and more, and I feel that the other person is the one I want, so the initial goodwill has developed into love.

Then with the longer time together, their love is different from the previous stage, which is the kind of love between men and women, but the love at this stage has been mixed with some other feelings, including habits and affection.

Therefore, at this stage, if they have confirmed that they are each other, then they will enter the marriage hall, and people with two surnames will get married and conclude a beautiful marriage.