It isn't about convenience or selfishness. It is about the woman not wanting to be pregnant, and nothing more. It need not have selfish reasons. Women are allowed to have sex. Contraception is not foolproof, and even if it were, it is entirely up to the woman if she desires to be pregnant.
It is her uterus, it is her bodily resources, it is her body, it is her bodily space. Therefore, it is her choice.