First, if he wanted reality, she would end up with curable and incurable venereal disease of one type or another. Throw in some drugs, a couple arrests, and a tasing for good measure.
Second, I guess in his world, the woman's right to choose is to go on a drinking binge, screw everyone in sight, and not have to accept the consequences. It seems to me that pregnancy is by far not the worst consequence.
Third and most crude, he would sell more comics if he focused on the drinking binge and the relevant activities; save the last page for the whole right to choose mess. Heard it before anyway.