女人无底洞男人一根经
[nǚ rén wú dĭ dòng nán rén yī gēn jīng]
This name humorously characterizes women as unpredictable 'bottomless pits' and men as 'single-minded', suggesting gender stereotypes in relationships, such as women's emotional complexity versus men's straightforwardness. However, its use may also carry negative or unfair implications.