This happens everywhere anyway.
Guys and their cars
Guys and their steroes (namely car stereos
)
Guys working out (muscles etc)
Guys and their sports stats
Guys and their computers
Guys and their guns
guys and their IQ
and in general:
guys and their anything in which you can put some quantity on and see that's it's objectivley bigger/better/faster/ than someone elses.
So it's not just e-peni (whats the plural?)