People around the world routinely engage in frequent sexual intercourse without becoming pregnant. If you show me even a fraction of that same number of people who have demonstrated an ability to consume ten cheeseburgers a day for a prolonged period without gaining weight, maybe you'd have a point. Otherwise, this is just a blatant false equivalence.
Yes, and people routinely take methamphetamine without having a heart attack and shoot themselves without dying. That doesn't obviate the fact that pregnancy is the direct result of coitus. Claiming you did not consent to the function for which a body part evolved when you used that body part is like saying you didn't consent to sweating when you went for a summer jog. Sure, you may certainly take measures to prevent an undesired outcome but the physical results of your choices can only be tragedy, not injustice.