Gorillas form harem-like groups, but they're not as large, 3 to 6 females per male (often the groups have multiple related males). Chimps have dominant males, b

Gorillas form harem-like groups, but they're not as large, 3 to 6 females per male (often the groups have multiple related males). Chimps have dominant males, but females can and often do have sex with other males in the group. Bonobos are just ridiculously promiscous :) I just found a book called "Human Natures: Genes, Cultures, and the Human Prospect" which claims that southern elephant seals have harems of 48 females on average O_O - that's probably the record among mammals.