What my parents knew - and I am still learning - is the real meaning of sacrifice in love.

Women weigh income more than physical characteristics, and men sought physical attractiveness and offered status-related information more than women. The service users preferred similarity on a variety of (mainly demographic) categories (including child preferences, education, and physical features like height, age, race, religion, political views, and smoking).
It is accurate to say that the research findings showed some behavior and attitudes of the online daters who joined the internet community with different motivations, expectations and backgrounds, but it is inaccurate to assume the behavior and attitudes reflect real interpersonal attractions.
This type of artificial "contact" contradicts the process of meaningful interpersonal interactions (to be explained), which generates love and attraction.
To explain the problem, I need to first elucidate the ingredients for love and the meaningful interactions.
Guards and prisoners had been chosen randomly from the volunteering college students.
Some participants developed their roles as the officers and enforced authoritarian measures and ultimately subjected some prisoners to psychological torture.
My 87 year-old father's memory has evaporated and he can barely walk now.
My 83 year-old mother is still vibrant and spends most of her days acting as his nurse without complaint because she strongly believes that her love and attention are keeping him alive better than anything or anyone else could (and I think she's right).
Without a moment's hesitation my mother said: "He always comes first and I know he feels the same way about me". How did they manage to each put the other first for the good of the relationship while staying true to themselves? So did having matched values on traditional gender roles.