Bokito may have become frustrated because the woman, who appeared to show interest, repeatedly walked away. Van Hooff speculated on what might have happened had she remained still rather than resisting. “I think he would have given her a few slaps on the back. And then, yes, he might have done what male gorillas do with female gorillas.”
From Wikipedia:
Bokito may have become frustrated because the woman, who appeared to show interest, repeatedly walked away. Van Hooff speculated on what might have happened had she remained still rather than resisting. “I think he would have given her a few slaps on the back. And then, yes, he might have done what male gorillas do with female gorillas.”