funny gorilla joke

ok so there where three guys that where desserted on a island after a plane crash there was also a female gorilla there and the lack of sex was getting to them so one day they went and caught the gorilla and they put a paper bag over its head and 2 of the guys held it down while the third started to have sex with it after about 5 minutes the gorilla got its hands free and instead of trying to get away grabbed his pelvis and proceeded to thrust him in deeper and deeper inside of here and the guy screamed get it off get it off and the guys responded we can't your on top and then he said no get the paper bag of i wanna kiss this bitch