Why do boyfriend and girlfriend have to travel once?

Ordinary male and female friends have their own advantages and disadvantages when they travel. Let me analyze it. It's purely personal. 1: If boyfriend and girlfriend go out to play, it is safer for girls to travel. At least have a male friend around to take care of you. It is really complicated for men and women to go out to live. It's inconvenient to live together, but it costs some money not to live together. 3. I feel that as long as this kind of ordinary boyfriend and girlfriend go out to travel once, something will happen later, such as ordinary friends becoming boyfriend and girlfriend. If I were you, I wouldn't travel alone with a friend of the opposite sex unless I like her or have a crush on her, so I want to take this trip to show my good performance and further develop our relationship. My daughter-in-law and I fell in love like this, and I invited her to travel on my own initiative. Then because I saw something that I didn't usually show on this trip, the relationship improved step by step. To sum up, when ordinary male and female friends go out to travel, there should be one person silently guarding each other, so a single trip will change some things.