Sign up for CNN’s Wonder Theory science newsletter. Explore the universe with news on fascinating discoveries, scientific advancements and more. “The meeting of ...

Intimate kissing (think lip-to-lip contact between two individuals in a sexual context) is typically the first partnered sexual behavior you experience. It's also the most common and the most frequent ...

Romantic kissing refers to the touching of lips between romantic partners — boyfriends, girlfriends, spouses, etc. Romantic kissing is rarely studied in sciences — aside from the very unromantic ...

(CNN) — “The meeting of lips is the most perfect, the most divine sensation given to human beings, the supreme limit of happiness.” So wrote the 19 th century French author Guy de Maupassant in his ...