Alright...I'll rephrase that...Temptation is a consequence of a sinful nature...
Although people tried to tempt God, God could not be tempted...Jesus on the other hand could be tempted but he did not succumb to sin...
You will need to rephrase that again. Temptation is external to us. Concupiscence is a consequence of original sin.
Before the fall, Adam and Eve wouldn’t have had a sinful nature.