Here, he says, Jesus is simply warning that it is not only wrong to cheat in one's action but also that it is wrong to cheat in one's heart. Therefore a person should not look with lustful intent at someone else's wife. He says these texts are not about masturbation and that the Bible does not explicitly mention that masturbation is a sin.
He explains that Jesus' message is focused on the moral implications of cheating in both actions and thoughts, suggesting that one should not covet another person's spouse. He also reassures that the biblical texts do not specifically address masturbation as a sin.