Sex fantasies are what most people have and yet most people keep secret. Despite the widespread opinion, sexual fantasies are not obligatorily connected to some sort of taboo sex or activities. In the majority of cases, people use fantasies as an escape from reality, and variety is the main goal they want to achieve in their mind.
It is very hard to achieve variety in sex life since it takes efforts and the ability to get many different sex partners on a regular basis. Unless a person owns their own harem, in practice variety on a regular basis is almost impossible. Of course, there are pickupers who specialize in luring their sex partners and increases the number of partners each week. But for this, one has to master certain skills, have a wide social circle, and devote a lot of time and also money to find girls (or boys), to lure and impress them, to have attractive looks, etc.
The majority of people have no time and opportunity to meet the need for sexual variety. They either live in the area where the social circle is not that big, or where everyone knows everyone or simply there are not many people of appropriate age and position in their place. Others have more interesting and important things to do, like job, career, hobby, or sports, and instead of running around looking for a new sex partner, they devote their efforts to other activities.
Yet, the need for variety and bright sex life remains, and people have fantasies. These are most often pretty innocent, like having sex with two blondes at the same time, etc. And here is where porn content becomes helpful in realizing those fantasies at least in some way.
If you check the categories on the majority of adult resources, they are very conventional, mostly stating the skin or hair color, a number of participants in the intercourse, or something like this. Such videos enjoy crazy popularity, in fact, they are the most requested and searched for. This gives a good insight into what people are fantasizing about.
It also gives a good insight into how much porn is useful in releasing sexual pressure and realizing secret or hidden fantasies. One does not need to think for a plot of the fantasy, does not have to focus and imagine. Everything has already been done and filmed. One only has to choose the video on the website, often free of charge, and see what he is used to seeing only in his head, enjoying each moment.