You don't.

"Centuries ago began the legend of the Reckless Dungeoneer. To this day the name and gender of that person is lost."

What a strange beginning for the book... Let's continue it without further interruption.

The first occurence of it's presence was the devastation of the Na'irhi Dungeon, supposately the highest level dungeon one could venter in, due to it's monsters attacking mainly the mental and genitals of the people venturing in. Countless lost their lives in the attempt of clearing it, and only two rooms were mapped at this point. The only registered monsters were a Vampire Lord and two Mistress Succubi, but such monsters never were alone at that time, they always had minions to capture their preys. Today's estimation of the population of the dungeon before the devastation was the three boss monsters mentionned earlier, fifteen Newborn Vampires, twenty Minor Succubi, forty HypnoDemons and countless Bats, Rats and Slimes of any kinds to exhaust any people coming in.

For today's adventurers, this dungeon would be classified as a S4 level dungeon, instead of the 9 level dungeon it was at this time, due to the non-classification of Sex Dungeon as such. In was only three decades ago that such classification was made for Dungeons that have Lust-based monsters such as Succubi or Slimes. But let's resume what we know of what happened at that time.

A question filled your mind.