On average they are exactly the same - those people have to be sleeping with somebody. In practice there are a small number of women who are incredibly promiscuous who bring the women's average up to the same as men's. There are is a relatively large number of men being on average less promiscuous than a relatively small number of women being very promiscuous.
women are more promiscuous in general i think, although you can't tar everyone with the same brush of course