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A 1994 study in the United States, which looked at the number of sexual partners in a lifetime, found that 20% of heterosexual men had only one partner, 55% had two to twenty partners, and 25% had more than twenty partners.[15] More recent studies have reported similar numbers. [16] Early studies found men with homosexual contact were more likely to have a very large number of sexual partners, but a 1989 study found a very high number of partners (over 100) to be present though rare in that demographic. The difference was attributed to sampling problems with earlier studies, and the influence of AIDS.[17]