Pornography, in general, it's meant to be fantasy. This is what the consumer wants. While this typically has to do with the behaviour depicted, it is also relevant when considering how the performers look. Much like in mainstream, non-pornographic media, performers undergo aesthetic transformations to make them more appealing to potential consumers (or, at least, what presumably most find appealing). Melissa Murphy is one of the most successful makeup artists in the California porn industry. To show off her work, she posts photos of the performers whose makeup she has done. Some of the photos are before and after. Here are some samples:
Porn stars before and after: Fantasy versus reality.
in Pornography