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 mostly the same as for rape. But the people involved are usually an adult and a child in the same family where the adult forces the child to have sex. Like rape, there must be sexual penetration as defined in the Sexual Offences Act. In order to prove that sex took place, it is important for the child to immediately see a doctor. (See: Rape, incest and sexual assault)