For one thing, no one goes to heaven. The only human who has ever gone or who will ever go to heaven. See John 3:13.
Luke 20:34-36 And Jesus answering said unto them, The children of this world marry, and are given in marriage: But they which shall be accounted worthy to obtain that world, and the resurrection from the dead, neither marry, nor are given in marriage: Neither can they die any more: for they are equal unto the angels; and are the children of God, being the children of the resurrection.
Since those granted a place in God's kingdom will be immortal, there will be no need for procreation and therefore no need for sexuality. Indeed distinctions between the sexes will be eliminated completely. See Galatians 3:27-29
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