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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
Here is a link to information on the website which will be of use to you:
The Kingdom of God on Earth www.thisisyourbible.com/library/show/170
After Death What? www.thisisyourbible.com/library/show/43
Marriage in the Lord 1: www.thisisyourbible.com/library/show/241
Marriage in the Lord 2: www.thisisyourbible.com/library/show/735
If you want to come to grips with what the Bible really teaches, why not take the free Bible study course on www.thisisyourbible.com? You may take this course either online or by regular mail.
This course will give you a background in the major themes of the Bible from Genesis to Revelation. As with everything we offer, there is no cost to you other than your time and effort. You will also have a personal tutor to whom you may pose questions either from the course itself or those questions which come to you as you read the Bible.
To sign up for the course, go to www.thisisyourbible.com and click on the "Students" tab on the left of the screen. Then scroll down and click on the blue bar which says "Sign up as a student today!" Fill in the registration form and submit it. If you sign up for the free online Bible course, you will be able to start immediately.
I hope you have found this helpful.