Your brain
Your brain is the single most important organ that determines the pleasure you feel (or don't feel). Folks with a lot of mental noise, distractions and stressors have a hard time feeling present during intimacy. This can cause a decline in desire and pleasure. Practicing mindfulness (such as meditation, body scans, and breathing) is an effective way to remain present and unlock your pleasure. It's called "practicing" mindfulness for a reason! The more practiced you are, the easier it'll be to connect with your pleasure in the heat of the moment. Don't expect results after one yoga sesh.
The vagus nerve
The vagus nerve is a humongous nerve that wanders to many areas of the body, including the cervix and uterus. Much like Las Vegas, the vagus nerve does not sleep. It's too busy being responsible for soooo many functions we rely on: digestion, heart rate, respiration, swallowing, and sneezing, to name a few.
One of the coolest discoveries is that, since this amazing nerve bypasses the spinal cord, uterus-owners with spinal cord injuries can still experience orgasms! When the cervix and uterus are stimulated, the vagus nerve sends signals to the brain that say, "ooh la la, that's the spot!"
B/D = bondage & discipline D/S = dominance & submission S/M = sadism & masochism (aka sadomasochism)
BDSM is the shorthand term to describe the groupings of bondage and discipline, dominance and submission, and sadism and masochism. BDSM doesn't always include sex, but it always requires consent and trust!