Sex and The Bible

What does the Bible say about sexual pleasure?
What does the Bible say about sex before marriage?

Notes:
Song of Solomon 7:7
'Know' is 'Yada' in Hebrew
Exodus 20:14
Genesis 6:4
1 Corinthians 6:16
1 Corinthians 7:3-5
Matthew 5:27-28
Ephesians 5:25-33