Final answer:
Lawyers are prohibited from having sexual relations with their current clients or representatives of their clients, unless there was a prior consensual relationship and there is no adverse effect on the representation.
Step-by-step explanation:
The prohibition regarding sexual relations between lawyers and current clients or representatives of their clients is option 2) Lawyers are prohibited from having sexual relations with current clients or representatives of their clients. However, there are some exceptions to this rule. Lawyers can have sexual relations with current clients or representatives of their clients if there was a prior consensual relationship before the lawyer undertook the case and there is no adverse effect on the representation. This prohibition terminates at the end of the representation.