For many reasons I'm not into chastity. And before you say that choice is up to mistress, let me remind you that any successful relationship is based on the needs of two people. When I saw a an image of a spiked chastity device it made me think about the why and how of such toys.
Broadly speaking there are three reasons why I don't like chastity. First of all sexual frustration is no substitute for mutual attraction. Most women know, we men promise them the moon - and throw in both Mars and Venus as a bonus - when we are horny. To be on edge 24/7 reduces mistress to an object of desire. As usual: who is serving who? Perhaps this is the part where sadism and dominace begin to bite each other.
Then there is the vanilla world. Chastity is a huge distraction to whatever you do. Most women expect their slave to be more than just horny. Full time chastity is a major impediment to professional success.
Do kinky folk have just one thing on their mind? Sometimes I wonder. Me, I strive to be more than just the sum of my desires. Unfortunately long term chastity achieves quite the opposite.