Very interesting question, you deserve a reply.
First off, why ass licking and does it cause any problem? Anal ring is called sphincter, which has an external ring and an internal ring. Anus is an important part of our body, all the internal never endings are at internal sphincter and outer nerve endings are at external sphincter. Anus is an extremely erotic yet sensitive place.
Now the next question, does people get pleasure, absolutely yes. But it needs to stay clean. The meaning of anal is ring, its the shape of anus. Anas is the end point of rectum, rectum came from the term straight. Our intestine is a 6 meter tube, only the last part of about 12 cm is rectum, which is straight. Now read carefully, rectum is the passage from where poop comes out, its not the place where poop stores. Once wash your anus, clean well, and if possible at the end insert a finger and make a rotatation. That will make sure nothing remains. But you cant avoid that pungent smell. Dont use any perfume for that.
Finally I am touching you real question, do girls like to lick male anus. Well, that a matter of individual choice, but generally speaking, girls dont like licking or rimming a male anus. Its because they feel its dirty as well as male usually have some hair that a girl dont have. Its irritating. For male licking anus of a girl with whom he will have anal sex is almost very common. He knows he is going to travel that passage, so givng a respect with lips and tongue is a great treat for him and her. But tell me, what she gets by giving a lick? she is not going to travel that rectum, she doesn't need to show her gratitude.
I have given lots of treat in my life, but hardly got such. From my experience I can assure you, getting a treat is absolutely mind blowing. A number of times I had sex with a partner and asked her to insert a finger, that also is enormously pleasant to have a great sex time. Guys, all I can do is suggest you to try this out, you would love a thin finger exploring your ass when you are pumping her pussy.