Once the heart strays from love of the other it starts to become sinful. What is important when Jesus says, “But I say whoever looks at a woman lustfully has committed adultury in his heart.” It moved the emphasis from the act, back to the desires of the heart. It is not so much looking at the woman, it is the desire of lust.
Fantasies would not necassarily be sinful, until there is a desire to do something that takes one away from the love of another one should have, like with the capital sins: pride, avarice, envy, wrath, lust, gluttony, and sloth. These daydreams can be a good thing, if they show one that this is not a path one should go down.
If one does not want to sin, it is important to avoid the near occasians of sin. So if you know these daydreams will do that, it is a good idea to avoid them. For the most part, we tend to do the same sins over and over agian, atleast the ones we are aware of. So be gentle, if you do the same sin over again go back repent and not try to do it again. Pray pray pray, and do penance and fast too if you can.
We sin all the time, some to worse degrees than others, some we know some we aren’t aware of. It is not good to get too caught up in all of it. It is also important and maybe more so to feel your self with acts of love. Some get too caught up in the Ten Commandments, but really miss the good news. That is the Beatitudes. Of course know what not to do, but make sure you do the things you should do and you will get the true gifts.
It is important to combat the sin in your heart, because that is the place where all sin orginates itself. Try to displace sin with love for the other. Not love, like pretty flowers and good feelings like we seem to me today, but a sacrifical love, one that may even hurt, but will produce good fruits for others.
So when you desire about that prime rib, don’t forget to enjoy it with someone who is in need of a friend or maybe even a bit hungry
So when you desire about your family all coming to a love of Christ, it is not so others can be envious of what a good family you are, but that you are leading your children to heaven and the love of the one who made them.
I guess if you must listen to that rap, make sure you mourn for what they are doing wronge, and pray for those who are in those horrible situations.