RAY J....THA "SEX MACHINE" SINCE AGE 10

Kim Kardashian's sex tape partner, Brandy's brother Ray J, is coming out with his memoirs. He's 26. Predictably, they're all about sex.

The book, reports BV Newswire's Karu Daniels, is due next spring and will "detail the hip-hop soul crooner's rise to fame, "including his sexcapades with more than 1,100 women, among them Whitney Houston, Karrine "Superhead" Steffens, and, of course, the Tush. He'll also claim to have had his first sexual experience at the age of 10.