This is sin. Adultery is where married people engage in sexual relationships with other people. There is only one place for sexual immorality and that is repentance. Stop it now. You were not saved to sin but saved to live in Christ.
Sexual immorality kills.
It kills in all kinds of ways physically, emotionally and spiritually. It is a sin and sin kills. They kept pestering God for things that were forbidden. They used every opportunity they could get as an excuse to return to Egypt. Tempting God is to knowingly go against His will.