1. Guys feel more powerful in the relationship.
How we behave in a relationship is largely interconnected and determined by our psychological needs. Often a man unconsciously wishes to feel more dominant in his relationship. Acts that are as simple as sticking out above your girlfriend or even choosing a relationship from the top are there to make you automatically feel more powerful in your relationship. A man usually sees a relationship as a combination of love and power struggle, so the height on his side leaves him with feelings that belong to a triumphant winner.