Orangutan Tattoo Fetish?

Sibu the Orangutan doesn't like the orangutan girls he lives with. Sibu, who lives in Amsterdam's Apenheul Primate Park was brought there in hopes that he would breed with the other females. Unfortunately, he has different preferences and other goals. Sibu seems to only be interested in tattooed blondes, tattooed human blondes, that is.  Who said tattoos aren't alluring? Of course, Sibu has good reason to feel sentimental about tattooed ladies- one of his earliest keepers fit the description. An orangutan with a tattoo fetish? Who could have made that up?