Model Boyfriend.

A young lady who has a mathematician boyfriend that develops complex models of genetic inheritance is talking to a new acquaintance at a party about their boyfriends.

The new acquaintance asks “What does your boyfriend do?”

The young lady thinks awhile and says “He models things.”

The acquaintance starts thinking Calvin Klein or Levi-Strauss or something and asks “What does he model?”

The young lady thinks a little more and says “He models Genes.”