Animal Liberation Analysis

In Singer's animal liberation we are given a concept that is in regard to equality. He explains this in a way that is different from what usually comes to mind when we speak on equality. The example of this difference is that of equal consideration of equality as different sexes male and female are both deserving of equality however, their needs differ in terms of application as he explains. He gives the example of women having the right to have abortion as an equality that is given to them to choose whether or not to abort the child. So just as women have this right so to must men if the logic flows, but men cannot have abortions as they cannot carry a child. So how can we ensure that the equality is across the board applied to different