Trivia: In the episode where Janet asks Jack if she's a bad kisser, take a look at Janet when he kisses her. Jack unexpectedly slip Janet his tongue (which surprises the audience as well) and that throws Janet off and shocks her. Her surprised face is not acting, and was really surprised he did that. You'll also notice that when they part, she can't keep a straight face.
Upvote valid corrections to help move entries into the corrections section.
Suggested correction: This does not happen, their kiss is closed and for 2 seconds and Janet doesn't ask about her kissing. She says before the kiss when they have few mishaps trying to kiss before the final kiss that no-one has ever picked her kissing before and his response was, "Just shut up and kiss me!" She responds, "Okay fine!" Then they kiss, mouth closed just lips.