There are some who fast and get nothing from the experience except for hunger and thirst. The Messenger of Allah ﷺ said this in the context of those who abstain from food and drink but not much else.
How does this apply in this day and age? Does watching a haram video break your fast?
The purpose of Ramadan is to overcome our desires and temptations... We must then control ourselves to refrain from any sin...
Shaykh Yasir Qadhi discusses
My dear brothers and sisters, the purpose of Ramadan is of course to overcome these desires, to fight our temptations, and our Prophet صَلَّى اللَّهُ عَلَيْهِ وَسَلَّمَ said that "It is possible that a person has only gained from his fast hunger and thirst, that the fast is not accepted." And some of the early scholars would say the easiest part of fasting is to abstain from food and drink, meaning the more difficult part of fasting is to abstain from sins. And therefore the goal of fasting is to control our eyes, to control our tongue, to control our hands. If, Astaghfirullah, your eyes wander and they see the Haram. If you do things that are not a permissible, you are in severe jeopardy of penalizing and of obliterating the rewards of your fasting.
There is a severe, severe crisis there that you are close to destroying your good deeds with your own hands, and I would strongly encourage and caution you to avoid such things. Technically, the fast will officially break when you eat, or when you drink, or when ejaculation occurs. That will break the fast. You eat or drink intentionally or ejaculation occurs, and it is caused by you or by a spouse, then the fast will break. Otherwise things that are lesser than this will affect the reward of the fast, but they will not invalidate the fast, and may Allah Subhanahu Wa Ta'aala make it easy for you and for me to perfect our fasts.