Based on the search results, I found a few relevant sources that provide information on the top-grossing porn films of all time.
The most relevant source is the Esquire article "65 Best Porn Movies of All Time - Great Porn Films to Watch" (2022-04-27), but it does not explicitly state the top 10 grossing porn films.
Another source is the Reddit post "r/AskHistorians on Reddit: There were three pornographic films in the 11 highest grossing in 1973, but none before or after. Why is that?" (2024-09-02), which mentions three pornographic films from 1973: Last Tango in Paris, Deep Throat, and The Devil in Miss Jones. However, it does not provide a comprehensive list of the top-grossing porn films.