Final answer:
Cunnilinus is the oral stimulation of the female genitals, while fellatio is the oral stimulation of the male genitals. They are both forms of sexual activity but differ in the body parts involved and the gender of the recipient.
Step-by-step explanation:
Cunnilinus is the oral stimulation of the female genitals using the mouth, tongue, and lips, commonly known as performing oral sex on a woman. It is a form of sexual activity that can bring pleasure to both partners. On the other hand, fellatio is the oral stimulation of the male genitals, also known as performing oral sex on a man. While both activities involve oral stimulation, they are different in terms of the body parts involved and the gender of the recipient.