user it's because you can't escape biology. The woman is the one who carries all the risks in pregnancy and childbirth. (And there are significant risks: incontinence, back and hip problems, right up to and including death -rare with our medical system, but still happens).
And yes, as a woman, if you really can't cope with the risk of pregnancy, and have moral objections to abortion, you too would be wise to practice celibacy. However, for women who don't have moral objections to pregnancy, they have two points at which they can decide, not one, because of biology. And bodily autonomy. A man's bodily autonomy is not compromised by a woman's decision to have an abortion.