Hi I would like to answer your question. There are many types of
buddhist monks, from various branches of Buddhism. If you are
talking about the strict types, of course they don't. Anyway
vegetarians like lower libido due to lesser metabolic catacystis
comppound in them. So the answer is they don't. This is for strict
orthodox believers.
Normally meat eaters have higher cell division rates due to the
animal food compound present in their meat. These compounds
increase the metabolic rates, and possibly adrenaline, endophrine
and reproductal glandular triggers. Also they are precursors of
activating the psycho-sexual centers.
Of course nowadays you can hear bishops molesting childrens and
so-on. You must see the type of persons they potray. But if you ask
about proper, very disciplined monks and nuns, they don't. This is
a fact.