Monkeyday News says: "Sibu the orangutan won't mate with the other orangutans, but get excited by blonde women, especially those with tattoos. Apparently, one of his early handlers was a tattooed blond female."
Sibu fancies his female keepers, especially blondes. That, the spokeswoman said, was common for orang-utans but Sibu has a fetish for tattoos, harking back to a heavily tattooed keeper who reared him.