Quote from Mitchell in The Future Dunphys
Mitchell: [aside to camera] We've always tried to make sure that Lily has a feminine influence in her life. Cameron: Because I'm sure it is so difficult for her to be around so much masculine energy all the time. Mitchell: Yeah, and recently, uh, she's been asking a lot of questions about the female body. And... Uh, we are not exactly experts, so we d- Just sit on 'em. We decided to call in the big guns.