This flexible disc allows women to have period sex without the mess. The Flex Company provides an alternative to tampons and other feminine hygiene products as they temporarily stop the menstrual flow and let couples get intimate, uninterrupted.
The shape contours to the body of the wearer, creating a soft barrier to the cervix that's undetectable by the female or her partner. This would also make it one of the most comfortable options available. The disc is supposed to be thrown out after every use. Flex is doctor-approved, and described as "safe, easy to use, BPA-free and hypo-allergenic." It's not associated with Toxic Shock Syndrome (TSS), either.
This is an empowering option for couples who simply want to get physical more often and have judgement-free period sex.