"And Oh Adam! You and your wife dwell in Paradise, thus both of you eat as both of you wish, and both of you don't approach this tree, then both of you will become among the wrongdoers".
The banned tree mentioned in this verse is sexual intercourse as explained in verses 2: 35-36. Lord said to Adam through verses 20: 117-119: "Oh Adam! Indeed Satan is an enemy to you and your wife, then let him not deliver you out of Paradise so that you may become unlucky; indeed, you will not have hungry in Paradise, nor nakedness.
And indeed, you will not be thirsty in it, nor will suffer heat from the sun". But by the temptation of Satan, Eve and Adam intended for sexual intercourse by rubbing pubic hair which is the banned tree, and sexual organs were revealed to them. Then as explained in verse 7: 22, they started to cover them with the leaves of trees in Paradise.
It is told in verse 38: 24 that all mingling men and women other than believers and who are doing righteous deeds will wish and try for illegal sexual pleasures. See explanations 2: 35-36, 110; 6: 10 and 28.