If you mean analingus, perhaps better known as rimming, I love it.
I have rimmed nearly all of my sex partners since I first began to be intimate with another person. Many were reticent but learned to enjoy it. Only a few remained uncomfortable from thoughts that they might not be clean enough. I'm not into scat play so being clean is indeed a requirement.

btw rimming is an excellent way to relax your partner's hole prior to easing your cock into that hole.