There is no evidence to suggest that a specific individual invented fellatio. Human sexual behaviours are complex and multifaceted and have likely been practiced throughout human history. The origins and development of specific sexual practices are influenced by a variety of cultural, social, and biological factors, rather than being attributed to a single inventor. Sexual behaviours are often influenced by cultural norms, societal expectations, individual preferences, and personal experiences, and therefore cannot be traced to a single person's invention.