A “sexual arms race” is a real thing and I find that amusing.
I wish it was so
A sexual evolutionary arms race happens when different sexes of a species have a different and conflicting optimal strategy for reproduction.
This leads to one of the sexes evolving a strategy to make the other sex more amenable, and the other sex evolves a strategy to avoid and overcome that strategy, and vice versa.
These strategies can be fucking wild after a while, creating extremely elaborate and bizarre sexual anatomy and behavior.
The most famous example is probably the duck’s corkscrew penis, evolved to navigate the corkscrew vagina.