You start life without STD's. Once you have non-barrier protected sex, you get tested. Then you know you're clear for next time. Then, the only time you could have an STD is after non-barrier protected sex, and so on.
In that principle, if everyone got tested after 'unprotected' sex, and everyone has sex with people they trust, then - as long as the woman is comfortable with her hormones getting screwed by the pill - condoms are not necessary.
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