The candy bar and McDonald’s analogy are both flawed because a person still recieves some of the good from consuming food, feeling food, a little nutrition, etc. This is why I think a better analogy is wine tasting, in which the wine is spit out. Here nothing is being consumed, merely enjoyed. The spitting out can be compared to spilling seed. But wine tasting is not considered sinful by the Church. Or is it?
No.
The reason they spit the wine out is the that alcohol effects the judgment of the taster. We can go to a wine tasting and consume the wine, no rule that it has to be spit out.
But what is confusing to me in this debate is that sexuality can be compared to eating.

I’m not focused on you, just the turn of the debate.
Sexuality isn’t just a fun activity to show love and attachment to our spouses.
When we have sex with our spouses, we cooperate with the Holy Spirit, the Lord the Giver of life. It is the most HOLY act that we can do with our spouse. Contraception profanes this HOLY act.
And furthermore, I posted what the Church considers the Capital sins
Vices can be classified according to the virtues they oppose, or also be linked to the capital sins which Christian experience has distinguished, following St. John Cassian and St. Gregory the Great. They are called “capital” because they engender other sins, other vices.138 They are pride, avarice, envy, wrath, lust, gluttony, and sloth or acedia.
Eating at McDonalds is not a grave sin, mortal sin. It does not destroy Grace in our hearts and does not cause us to separate from God. Eating at McDonalds does not require a trip to confession, neither would gasp, enjoying the food.
Sodomistic sex and masturbation to climax are prohibited by the Church not because they cause pleasure,** it’s because they are absolutely closed to life**.
The marital embrace must be unitive and procreative. Procreative does not mean, conception will happen. That is something God decides. Procreative means we do nothing to impeded procreation. If I am infertile, I did nothing to cause the infertility.
These discussions are getting dangerous, and confusing. Remember there are lurkers here, anybody who is not sure about church teaching and gets confused reading what’s been posted can come to believe Church teachings are incorrect.
I would almost like to see CAF ban NFP discussions.
I would suggest also reading Church approved writings on this subject, as opposed to CAF dissenters on this subject.
Sorry for the rant.