When I became a man, I put childish ways behind me.
(1 Corinthians 13:11)
Physical growth is almost non-optional. If a man eats the right food, he will grow. Emotional growth is a lot more complicated, particularly since his emotional development is connected to that of his spirit.
There is an old story about two people named Truth and Lie. One hot day, Truth decided to take a swim. Having nothing to swim in, he removed his clothing and jumped in the water in his birthday suit. Lie came along and seeing Truth's clothing on the bank decided to put them on and head into town. When Truth got out the water and realized what had happened, he followed Lie, stark naked.
The book Isaiah talks a day when seven women will look for one man to give them his name. They will be willing to marry the same man and share him with six others. This will never work because marriage is a union between two people that results in something greater. Marriage requires, an exclusive, committed relationship that result in two people becoming one emotionally and spiritually.