For those who don't experience ASMR, it can be difficult to wrap your head around this "tingling" feeling and how something as simple as whispering or clicking could trigger it. But recent research has shown that ASMR is more than just a self-reported feeling—it can be measured physiologically. A 2018 study published in the journal PLOS One found that people who watched ASMR videos had a decreased heart rate in response, which can explain the intense feeling of relaxation many people report. Researchers also recorded higher levels of skin conductance in people experiencing ASMR, indicating arousal or excitement (likely due to the tingles).
‘Attention Induced Head Orgasm’ was the first recorded name for this experience and can be found when searching for ASMR origins. I believe (unfortunately) theres always going to be a sexual association. Also, the fact our body is flooded with endorphins also gives those who either a) lack in knowledge and b) the media a reason to think ASMR has such a strong sexual link.
While many colloquial and formal terms used and proposed between 2007 and 2010 included reference to orgasm, there was during that time a significant majority objection to its use among those active in online discussions, many of whom have continued to persist in differentiating the euphoric and relaxing nature of ASMR from sexual arousal. However, by 2015, a division had occurred within the ASMR community over the subject of sexual arousal, with some creating videos categorized as ASMRotica (ASMR erotica), which are deliberately designed to be sexually stimulating.