Amongst gay couples, it's often referred to as "A Boyfriend Twin"
"While you may be familiar with the old saying, “opposites attract,” in reality, what the heart wants is someone who resembles its owner and that resemblance increases the longer two lovebirds stay together.
University of Michigan psychologist Robert Zajonc conducted an experiment to test this phenomenon. He analyzed photographs of couples taken when they were newlyweds and photographs of the same couples taken 25 years later.
The results showed that the couples had grown to look more like each other over time. And, the happier that the couple said they were, the more likely they were to have increased in their physical similarity."
Read more about this interesting phenomenon here...
"Fear Eats the Soul"