#3 is alluding to the devilish side of BDSM/Bondage/Alt sexuality and I like that it is more brandable than the two designs that came before it...but I would also like to see some designs that go in other directions. BDSM is not about being evil or even devilish. It's about female empowerment, sexual empowerment, the ability to enjoy your own sexuality. So, sexy and brandable. Maybe incorporate some rope into the Logo or tagline? Here is a logo that I like very much by Rope Rookie:
http://roperookie.com/