If only my asshole was like that I could take a **** before jamming admin's rock hard cock up my yaoi hole, and he wouldn't have to get bits of **** stuck to his massive ogre dong.
That might be the case in this demonstration, but it's very possible to make the object themselves hydrophobic. If I recall, it's a very specific pattern texture which would be easy for a machine to replicate and mass produce bottles with it.