"Well, I don't want to have fat sex, you know," Kirstie says. "I've been celibate for four-and-a-half years, because I think I've become like a born-again virgin. It's by choice. Even when [I was thinner], I wondered what I looked like when I'm walking in [the room]. I was sort of inhibited. Now, I know what I look like, and I just can't see some guy's eyes going, 'Oh, my God!'"