ASMR

ASMR (Autonomous Sensory Meridian Response) is a relaxing sensation triggered by specific sounds or visuals, often described as a ``tingling' feeling in the head or spine. People watch ASMR videos for stress relief, relaxation, and sleep improvement. People can share certain triggers for ASMR, but triggers are different for most people.
The bad news is that only 20% of people have this phenomenon.
My trigger is the finale of Nessun Dorma.

It is a feeling of well-being combined with a tingling sensation in the scalp and down the back of the neck, as experienced by some people in response to a specific gentle stimulus, often a particular sound.
It's not an orgasm, which has its own spectrum of response, but it is a very pleasant sensation that can raise hairs in the back of your neck.