Sinful has been THE name in affordable playful kink in pink. Now. Sinful just made `sexy` a little bit sexier! NS Novelties is excited to introduce Sinful: Black. Everyone`s favorite collection is now available in a stunning midnight black finish while continuing to deliver the quality you expect. Black. nickel-free anodized hardware. aesthetically striking embossed vinyl. and lined in soft yet durable liquid-play friendly neoprene.