Estimates of the prevalence of male‐male sexual contact are derived using data from five probability surveys conducted between 1970 and 1990. Estimated minimums of 5 to 7 percent of U.S. men report some same‐gender sexual contact during adulthood. Because of the likelihood of underreporting, these estimates might be considered lower bounds on the actual prevalence of such contact. Estimates show relatively little variation across social and demographic subgroups with the major exception that higher prevalence is reported among never‐married men, particularly those 35 and older. Some lesser variations are also found by service in the military, current residence, and current religious affiliation. Fragmentary evidence from these surveys suggests that some men may have episodic male‐male contact in adulthood while other men may have a relatively consistent and exclusive pattern of same‐gender contacts. Only one‐quarter to one‐half of the U.S. men who report male‐male contacts in adulthood also report having had such contacts during the preceding 12 months. In addition, the majority of men reporting same‐gender contacts in adulthood also report some male‐female contacts. Among men reporting same‐gender contacts in the preceding 12 months, however, the majority report exclusively male sexual contacts throughout adulthood. Potential implications of these findings for HIV prevention and research are discussed.