It would be easier if you would give a little ground here, based on what you know and have experienced. You are sexually experienced, right? I assume pretty much everyone here is, so we understand that we're not consenting to a pregnancy every time we fuck. Birth control methods fail; they are subject to human error. People are wired with a serious drive to procreate that we have not mastered. We're not entirely sane when we're fucking. There is a big space here between some kind of implied consent and the reality of sexual behavior. It isn't anything like giving consent in other areas of life, so it's not fair to stand on that. That isn't to say there isn't some responsibility, which we address through sex ed and parental (god help us) guidance. It should strike you as bizarre that the majority of people who want to say that sex is consent for pregnancy are the same people who support the undermining of sex education.