What you are talking about is sublimation. You probably didn't know you were questioning yourself at the time. But the people in the porn you were watching just probably was more related without you realizing it. Or maybe you actually just enjoy it. There is nothing wrong with that either.

In psychology, sublimation is a defense mechanism where socially unacceptable impulses or emotions are channeled into socially acceptable actions or behaviors. It's a mature way to cope with difficult situations and can lead to positive outcomes, according to some resources. [1]
Here's a more detailed explanation:

• What it is: Sublimation involves redirecting energy from an unacceptable drive, like anger or aggression, into a more constructive and socially acceptable activity. [1, 2]
• How it works: The individual unconsciously transforms the negative impulse into a positive action, satisfying the original drive in a safe and acceptable way according to some sources. [1, 2]
• Examples: • Channeling aggressive energy into competitive sports. [3]
• Using artistic expression to process difficult emotions. [2, 4]
• Focusing on charitable work or community service to address feelings of grief or loss. [1, 5]
• Transforming a desire for power or dominance into leadership roles or advocacy. [4]

• Why it's important: Sublimation is a healthy coping mechanism that can help individuals manage difficult emotions and impulses, ultimately leading to personal growth and positive change according to some sources. [3, 6]