Relationship.
The entrance is either need or exploration.
A relationship is bonding between two completely separate belief system, and ofcourse life and self. In a relationship the childish mind becomes more and more comfortable in expressing itself. In a way it becomes valnureable.
A relationship will have all the 9 yards of emotional experience. There will be personal life, mutual life, expectations, challenges, sharing, helping, affection, intimacy in every relationship.
There is difference in basic nature of person you are hanging out, some people will be compliant, some will be egoistic, some will be very mature.