my only zoo-related regret is this one time when i pleased a boy who wasn't mine.. prolly was "sexual awakening" for him, because later his owner complained about him trying to hump their furniture (not them weirdly enough, or maybe they were too embarrassed to admit it?) to get off. luckily he "only" lost his balls for decision of dumb and horny younger me... was my lesson why not mess with other people's animals.
btw, not to nitpick, but you having a wife kinda makes this not-a-zooexclusive thread