It means you like your middle name... Try going by it instead of your first for a while.
Tell me more about your "y".
Seriously though, and I'm slightly frightened telling you this, because there are some weird people out there that would use this information poorly, I'm afraid, while Gyllenhaal's sex drive is very high, (at least according to this signature), his sexual imagination is also very high, his sexual frustration is relatively low but not all needs are being met, and has not found a partner with whom to express his needs. Too bad we can't see the actual photo, I could tell you more based on the pressure that was applied when writing the letter.