This book is about survival: Our own survival. Some time ago, I was watching a medical motion picture where it was shown the case of some people who had an accident in the mountains. Some of them died. Some others survived. One of the conclusions was that there is a personality that some people have, that makes them be able to resist and survive in almost any circumstance. Some people call it

A thematic puzzle is a kind of crossword puzzle where all the questions are focused on a specific subject. For example: If we speak about classic horror films, a question could be:

This book is focused in the works of William Shakespeare. However, it is not a history book. It is a book of games inspired in his figure.

This book is about sex. Our own sex. Sex is a problem: The problem to get more sex. In the stone age, people used to solve this problem using the easy way. If you were a man looking for an intercourse, you just had to "go hunting" (hunting a girl, of course!).

The girl used to awake in your cave, just to notice she was officially married (with you). Nothing else was needed. Perhaps some inquisitive reader may be wondering about her feelings.... Feelings? What was that?

Well, the fact is that the relationships between the sexes started to be more complicated, and more, and more...until...