He doesn't appear to have made a public statement about that. He was described as bisexual by biographer James H. Jones, so he was likely between 2 and 4. Kinsey himself believed that one's score...
I assume that you mean the Dropkick Murphys song. It came out in 2005 on The Warrior's Code, and it came out as a single in 2006.
Dave Loggins
Alfred Kinsey was born on June 23, 1894.