Salah Talih wrote:
So my final conclusion is that the Butcher IS Pyramid Head, but every sinner sees his/her monster in a way.
I think that is right. Butcher and Pyramid Head are just different manifestations of the executioner or punisher from the order's lore.
But Travis does seem to be interested in sex, although it seems his sexual desire is much more repressed. The game has sexy nurses and the two-back monster seems to have sexual symbolism too.
Also the butcher slices through the reproductive organs of its victims. This could be interpreted as sexual frustration or Travis' spite towards fertility as he did have a troubled, unaffectionate childhood.