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I've heard of that idea before. It wouldn't work for many reasons, the main being "cache invalidation." i.e. it becomes obsolete as soon as somebody has another sexual partner. And at that point, you're trusting users to just update it.

That doesn't even mention the privacy issues involved.

Yes, because I'm sure tons of people will line up to have their fingerprint/eye pattern associated with contraception and their last potential hookup in a 3rd party database. What could go wrong?

"Yes, because I'm sure tons of people will line up to have their fingerprint/eye pattern associated with contraception and their last potential hookup in a 3rd party database."

Sadly, I am also sure of this.

Theoretically (not that I think it's necessarily a viable product) could you tell if a woman is on birth control from a blood sample?