We do the same thing when we speak of God's hands or face. God is outside us, beyond us, with us, and within us. This awareness is usually called 'consciousness'. Our awareness of our thoughts and feelings, and our ability to act on the basis of this awareness, are among the things that most separates us from other creatures, and is a mark of the image of God in us. In answer to a question, Jesus said in the New Testament that in Heaven, men and women are not given to each other in marriage.
Gender is a full-fledged part of the body.
They exist for the sake of living a Godly life in this world. When this world passes, they're no longer needed as we know them today, they either entirely pass away or are transformed into something else. Loneliness comes from emptiness caused by an absence. Emptiness implies that something can fill it. Jesus 'disarmed' those in power by making it clear that they couldn't stop Him.