My guess is that the top cock is the straight cock.

Bottom fucking his top

Top knows how to fuck

Nothing like a tattooed top

Every top's dream

Top just can't get enough

Tiny bottom shows huge top how rough he wants it

Everyone deserves a top like this

I love watching the top's ass as he thrusts

Top tier position...

This was a top performer on r/totallystraight

How lucky the top must've been