Saint-Léger-en-Pons (Charente)
A megaphallic thorn-puller (Spinarius) with his right 
  leg (broken at the foot) held up by his right hand,
  thus revealing enormous apparatus of desire.

  Compare with a female thornpuller at Béceleuf
and with a more worn male at Graimbouville (Seine-Maritime) in Normandy...
click for a corbel 
  depicting   Avaritia on the same 
  apse
 
  Avaritia on the same 
  apse
  ...and this granite example at Monterrei (Monterrey) (Pontevedra).
MegaphallThornpuller.jpg)
  * * *
The famous Capitoline Bronzes (moved to the Capitoline Museum 
  in Rome in the 15th century)
  included the Spinarius athlete removing the thorn from his foot
  in such a manner as charmingly to reveal his penis.

A good example of a late Roman depiction of the motif can be seen at the Musée Crozatier at Le-Puy-en-Vélay.

The scene is set during the grape harvest or a Dionysiac 
  rite, or both -
  but the man with the thorn is not exhibitionist, rather it is the man removing 
  it for him.
  Note that someone is pulling the latter's hair - or is it a tendril of a vine 
  ? 
In the Romanesque section of the same museum there is a fine 
  example
  from 800 years or more later, who, similarly, is not exhibitionist.

A discreetly-exhibitionist thornpuller dominates the wonderful 
  façade of the church at Aregno (Corsica),
  indicating how powerful this motif and its message were in the 12th century.
 .
.
Click to see two more-obvious Corsican male exhibitionists.

Note the entwined snakes over the window beneath.
A modern thorn-puller.

Wolfgang Tillmans - Anders pulling a splinter from his foot, 2004.
The Classical motif travelled to Northern India, 
  where a svelte and robed female 
  heavenly being can be seen amongst the hundreds of figures
  on the 11th century Parasnath Temple at Khajuraho (Madhya Pradesh)
  removing a thorn from the sole of her foot.