To discover the girls marked with the maps, the Phynx must have sex with hundreds of girls. Their labors are lessened when in Rome they are given X-ray glasses, which visually strip the girls down to their underwear.
In order to locate the girls indicated by the maps, the Phynx had to engage in sexual encounters with many girls. The labors were eased in Rome when they were given X-ray glasses that revealed the girls' undergarments.