A nurse is inquiring about a client's sexual history. Which of the following should the nurse ask about? (Select all that apply.)

A) The dates and types of sexual activities engaged in
B) The number of sexual contacts
C) Names and genders of all partners
D) Potential sites of infection
E) Ethnicity of all partners

Asking about the dates and types of sexual activities, the number of sexual contacts, and potential sites of infection are relevant for assessing risk factors for sexually transmitted infections and understanding the client's sexual health history. Names and genders of partners can be relevant for contact tracing if an infection is diagnosed, but are not necessary for initial history taking. Ethnicity of partners is not relevant to the assessment of sexual health and could be considered discriminatory.