Okay, technically speaking, this large waterproof mat is not for period sex, but fluids are fluids, right? Throw down this three-tiered terry mat for guaranteed bed protection from even the wildest period sex positions. You’ll never max out its absorption capacity (which holds up to a liter of fluids), and it’s made to be comfortable enough for a kid to sleep on, so you won’t get any of that weird crinkling sound from other incontinence bedding products. Sure, you could easily throw down a dark-colored towel, but you can cover up to a queen-sized bed with this thing, which is just as comfortable, easily storable, and machine-washable. And if you do somehow accidentally stain your sheets, you can treat a period blood stain with cold water and stain remover.