Don't be confused Bubu - hide your eyes from the ignorance that is in this thread.
Anyone from any race can have full/thick lips.
It is true that people who have genetic links to certain areas of Africa have a propensity to have larger lips than other groups.
To suggest that full lips is a black thing is incorrect and ignorant because many other people who aren't black have full lips.
Also, Africa is a huge continent with the largest genetic differences of people anywhere in the world. There are tribes and groups and individuals there who do not have large lips at all. It just so happens that where the majority of slaves were stolen from in west Africa has populations which often have larger lips. These people ended up in the Americas, and many of the descendants of these people have large lips. Many also have small lips.
Large lips are seen by some as attractive. Some people who don't have large lips, whether they are white, Asian, black or whatever sometimes choose surgery so that they can achieve what they consider to be aesthetically pleasing. Some many then use their larger lips to give oral pleasure to other people