Original sentence: Another theory, now shown to be mistaken, is that only humans engage in homosexual intercourse; it is now known that bonobos regularly engage in various forms of intercourse and/or stimulation of the same sex, in addition to other animals such as dogs.Extrapolating from this observation has led some to the conclusion that the animals are engaging in sexual intercourse for the sake of pleasure.In fact, it is not possible to know what another animal is feeling when it engages in sexual intercourse.In this way, they stimulate themselves and each other usually until orgasm and ejaculation are achieved.In this, too, there is a debate over what role, if any, pleasure plays in these animals' behavior.Others contend that intercourse could equally well be motivated largely or wholly by instinct in these animals.There is a common belief that dolphins, bonobos and humans are the only animals that are known to have sex strictly for the sake of pleasure.To engage in sexual intercourse, the erect penis is inserted into the vagina and one or both of the partners move back and forth to repeatedly remove and reinsert the penis, usually without ever fully removing it
Edited sentence: Another myth is that only humans have homosexual sex; it is known that bonobos regularly engage in various forms of intercourse and/or stimulation of the same sex, in addition to other animals such as dogs.Extrapolating from this observation has led to the potentially flawed conclusion that the animals are engaging in sexual intercourse for the sake of pleasure.In actual fact, it is not possible to know what an animal is feeling when it engages in sexual intercourse.In this way, they stimulate themselves and each other usually until they achieve orgasm and ejaculation.There is a mistaken belief that dolphins, bonobos and humans are the only animals that are known to have sex strictly for the sake of pleasure.To engage in sexual intercourse, the erect penis is inserted into the vagina and one or both of the partners move back and forth to repeatedly pull the penis out (but usually not all the way out) and push it back in