Take male strategies for success in the world. If you've got all the advantages, if you're attractive and clever and all of that, you will generally go for very high quality females.
One of the biggest mistakes that people make when they think about memes is they try to extend on the analogy with genes. That's not how it works. It works by realizing the concept of a replicator.
Certainly almost everything we do and think is colored in some way by memes, but it is important to realize that not everything we experience is a meme. If I walk down the street and see a tree, the basic perception that's going on is not memetic.