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Latex is natural rubber and is indeed biodegradable though it is slow to break down. Polyurethane condoms will probably be found in the archeological record.
I only use authentic Amish made sheep intestine condoms because they are definitely biodegradable.
And reusable!
and edible.
I mean, true but they're better than the styrofoam ones....
/s
(I know you're joking but the builder in me is genuinely curious if you can make a rubber-like substance out of polystyrene)
Styrene is in the vynal family, Styrene-Isoprene-Styrene is used to make extremely expensive surgical gloves so I'm going to say yes.
Polyurethane also biodegrades, just very slowly. Since condoms are very thin there will be not much left of them after a century
Sheep intestine is another biodegradable option. Probably worse environmental impact than natural latex though.