because pedophilia is child abuse,i dont care how u argue that a child is far mature beyond his or her age....they cannot be fully mentally and psychologically comprehensive of their actions,or capable of understanding the intricacies and implications of their actions,hence sexual relations with an adult is out of the question......depending on the age of the child,the perpetrator can be sentence to varying degrees of sexual assault of a minor.....if u caught fucking a kid below 12 years old,good fucking luck.
bestiality well an animal is unable to agree or consent to being fucked by a human being....so yeah......sex with a monkey is no no......well to be honest i dont really give a shit if u fuck a chicken or a sheep,but animal rights activists and nutjobs might make a big fuss.
as for necrophilia well its open for negotiation......i suppose as long as u have consent and ur not fucking a child corpse......u can go ahead