It turns them on!
Cunnilingus is just a fancy way to say “eating out” or just oral sex on a female’s private parts/genitalia, (clitoris, the vulva or the vagina). The clitoris is the most sexually sensitive part of a female’s genitalia. We can compare the clitoris or “clit” for short to the head or “tip” of the penis.
But here’s the catch – the clit has many, many more nerve endings, making it even more sensitive. One reason guys may like to eat out girls is because stimulating the clit may result in sexual arousal (getting turned on) and even orgasm (cumming).