In any case, the data do not provide information on the context or duration of such relationships, and care must be taken not to overinterpret distinctions in behaviors and risks between main and nonmain relationships. Additional research is clearly needed to understand the personal significance and implications associated with these differentiations. We also need to learn more about how these relationship distinctions might differ between older and younger MSM, as well as between MSM who identify as gay or bisexual.