Lust

 قال رسول الله صلی الله علیه و آله:طُوبَى لِمَنْ تَرَكَ شَهْوَةً حَاضِرَةً لِمَوْعُودٍ لَمْ يَرَه

The biggest evil of lust is that makes a human being neglectful of a real mission in life. The goal is forgotten and the person falls into an unending cycle of Temporary pleasures.

Masturbate or self – satisfaction that has been referred to as masturbation in religious texts, means doing something to discharge the sperm from the body. this is haram and considered as cardinal sin.