Good news! This is actually becoming perhaps a very effective contraceptive for men!
"Researchers from India have developed a biodegradable gel for female contraception. Reporting their results in Materials Science & Engineering C, they found that the active ingredient styrene maleic anhydride (SMA) embedded in a biodegradable hydrogel kills sperm and prevents egg cell formation. ... SMA is already in Phase III clinical trials as a male contraceptive implant in the vas deferens, the vessel transporting sperm in men. But in addition to killing sperm, SMA also disrupts the development of female egg cells. ..."
Contraceptive hydrogel proves safe in rats – Physics World
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