I discovered the erotic possibilities inherent in (correctly applied) choking many years ago. I was curious about why it intensified orgasm so much, which led to research on the changes that occur in neurotransmitter production & re-uptake during the initial phase of oxygen restriction & CO2 accumulation in the brain. In addition, beta-endorphin levels rise significantly which doubtless is the major contributor to the intensification of pleasure — along with an overall heightened response due to just the right amount of autonomic reaction (basically, your body reacting as if you’re afraid). One of my partners enjoyed me choking her with a soft cord (more comfortable for her throat than my hands) while having anal sex; she’d request it every single time because it made her cum harder than she’d ever known previously. But the caveat is that one must pay extremely close attention at all times, which for me meant holding off on my own pleasure until we reached the post-choke phase. And of course never do under the influence of alcohol or any sort of drug (including anti-histamines, which can induce drowsiness).