ASIS International (ASIS) Professional Certified Investigator Practice Exam

The best definition of "rape with a mentally defected person" is characterized as sexual acts without consent that involve intelligence impairment. This definition aligns with legal and psychological understandings of consent and mental capacity.

In legal contexts, consent is a crucial element for any sexual act. If an individual has a mental impairment that affects their cognitive abilities, they may not be able to give informed consent. This lack of capacity to consent is what distinguishes such acts as rape. The concept underscores the importance of understanding the victim's mental state, as it directly relates to their ability to agree to engage in sexual activities.

The other options do not accurately capture this definition. For instance, consensual sexual acts with mentally competent individuals suggest a scenario where consent is present, which is contrary to the definition of rape. Additionally, the specification of sexual acts performed in private settings or involving sexual toys does not address the critical element of consent or mental capability, failing to relate directly to the definition of rape in the context provided.