no I don't think the limit is at fingers and toes, I think the limit is at being a human. Sperm is not a sentient being-- a developed child is. I don't see that men want to control the issue but even if men did, that doesn't change the fact that terminating sentient living things is bad, in my opinion. So to answer your question, we ethically decide the limit by deciding if a fetus is a human, and if human life is worth being inconvenienced over. thanks for the discussion