It's funny that Brenda does not want to be treated like a kid anymore because she is wearing pajamas with the feet attached.
Lester: Your grandma asked me to speak with you.
Calvin: Why? I know all about sex.
Lester: The mechanics maybe, but we're talking 'bout more than that.
Calvin: You mean the kinky stuff?
Lester: Well, what I really wanted to talk to you about is sex.
Calvin: Oh? O.K. What do you want to know?