The law says that people who may not get married to each other because they have a blood relationship or an adoptive relationship with one another also may not engage in acts of sexual penetration with each other. If they do, then they are guilty of the crime of incest. The rules about incest are generally the same as the rules for rape, except with regard to incest the law states that mutual consent is not a defence with regards to incest, whereas consent is used as a defence in rapes.

In cases of adult/child incest only the adult is charged with the crime. Like rape, there must be sexual penetration as defined in the Sexual offences Act.
(See Rape, incest and sexual assault).