The supporting text depicts their helpless bewilderment and anger. Their captors admire their bodies and mock their helpless state, they hint at an unpleasant future. Some of them end up being shipped off to paying customers in boxes or nothing more than underpants and hog ties.
The drawing style is very naïve but does convey a sense of the male animal subjugated. The situations and story telling are quite effective in promoting fantasies providing you have a smattering of French (and ideally a dictionary comprehensive enough to cover colloquialisms and rude words). I quite like these pictures.
JF has posted a lot of pictures at his blog:- Les Machos de JF
and you will find a number also in the recent GMBA archives (link in sidebar).
For earlier articles in this mitchmen series click on the label A-Z below.