What a nice story! Cleaning up eyebrows shows nicely the discrepancy between intimacy (feeling love and care) and erotica (feeling lust?).
The hair grooming in the article probably felt similar.
Thinking about the physio therapy, her upper body felt very warm and soft but it was probably a rather standard technique for firmly moving the joints and ligaments in legs and hips.
What it made most intimate was not just the softness of her body but also the care she took for the movements, knowing that it would help.
So my limbic system went into oxytocin producing mode, which the aware mind easily picks up with warm thoughts. I think that's where the bridge between intimacy and sexual thoughts can happen, but there my thinking was not firmly going into that direction, it just felt warm and comfortable, even a bit emotional.
In your case the feelings apperently came from both directions, it was not a professional/client context after all.
> What it made most intimate was not just the softness of her body but also the care she took for the movements, knowing that it would help.
100% that was a big part of it too for me. It was the care and attention that was going into it, plus the element of trust that goes into giving someone consent to inflict sharp but short-lived pain.
I’d actually be really curious on the physiotherapy side of it whether there is actually a combination of intimacy and professionalism happening on the other side of it. I’ve done physio with people who did not give me warm and fuzzies at all, and with people who, like for you, left me with that nice oxytocin sense of satisfaction. I wonder if the people who left me with that feeling are good at what they do because they have some added degree of empathy or mirror neurons or whatever that makes them feel good when they treat their patients softly and intentionally.