To repent and cleanse off evil karma from evil sex acts(masturbation, pornography viewing, adultery , visit prostitutes)
Recite "OM MANI PADME HUM" as many times as possible with a repent heart everyday and dont commit the acts again
Benefits of Reciting "OM MANI PADME HUM"
http://fpmt.org/education/teachings/lama-zopa-rinpoche/the-benefits-of-chanting-om-mani-padme-hum/
http://fpmt.org/education/teachings/lama-zopa-rinpoche/the-benefits-of-chanting-om-mani-padme-hum/