ANSWER:

You are sinful big time if this is caused by watching porn as you chose to be in such a state and miss the prayer intentionally! 

Fear Allah and remember that every time you watch such filth, Allah sees what you are watching and hears it as well!

QUESTION: I previously asked a question about releasing pre cum before prayer. But if I keep releasing and feel it won’t stop can I pray at home? Am I sinful? And also what if this was caused by porn