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People in the use of condoms will often try to distinguish the condom is negative, but this behavior is likely to result in the failure of contraception. So I designed a small bulge in condoms, when people use can touch to distinguish, help us to quickly correct condom use. To make our love a more safe and harmonious.
Yanshan University
Qinghuangdao, China
Cheng Yongsheng
Yan Bo
