Despite the different versions that arose as a result of spreading myths by word of mouth, it can be safely stated that Perun and Weles contributed to our creation. One of the versions says that one day, after taking a bath, Perun wiped his body with a straw. The gods quarrelled a lot about who should create a man, so Weles took the straw and made a human body out of it. When Perun saw it, he decided to breathe a soul into it. This is interesting considering we were created by the evil one. This explains why our body is imperfect (bad) and human life so fragile, and why our soul is good. 

The second version says that we were created as we are because of Perun's carelessness. He moulded us out of clay and left us with a padlock moments before the very revival. Weles couldn't let go of the chance to tease Perun. Thus, in his absence, Weles decided to hollow out various holes, concavities and convexities in the clay figures. This is how our desires, not only sexual but also the need to satisfy hunger and excretion, arose. In this version, there is also a mention that Weles spat on the first people, which caused diseases. It should be noted that in this case there is a huge correlation between Slavic mythology and scripture. In Genesis II. 7. It says "then the Lord God formed man from the dust of the ground and breathed into his nostrils the breath of life, and man became a living being." It can therefore be concluded that this version could have been created later than the above-mentioned one.

Source: https://steemit.com/polish/@veroniq/slowianski-mit-o-powstaniu-czlowieka