Given scene/plot descriptions from movies or TV shows, and given a specific question about the scene, summarize the question into a title

I'm always confused about the quote "Ouch, ouch, you're on my hair." in the movie Wedding Crashers. What does it really mean? When this quote is being translated into the Chinese version, it means "Stop touching my hair during sex." It just sounds ridiculous to me.
What does you're on my hair signifies in Wedding Crashers?