Why are plus size ladies tickled on their inner thighs and groin more often?

After seeing a lot of different clips over the years I have a feeling I've noticed a pattern when it comes to plus size female lees. All the way from merely voluptuous to straight up bbw/ssbbw ladies. The lers seem to go for their inner thighs, hips and groin much more often on average, while with smaller petite girls the tickling is in many times limited to more tratitional spots (armpits, belly, waist, feet, knees, neck). As someone who personally is a fan of thigh and groin tickling, it's easy for me to notice how these spots are often skipped or barely glanced over, but seem to be less so with voluptuous and bbw lees.
As far as I can tell this phenomenon isn't limited to any single producer, and I've noticed it in tickle torture videos made by complete amateurs on porn sites, even on Youtube.

Does anyone know or can guess the reason? Are bigger women on average less sensitive on spots "above the belt"? More often than not their privates and the spots nearby happen to make them really lose control, however, most petite girls go crazy when tickled there too. I'm primarily asking the lers with some experience, who managed to tickle a variety of women (producers included), if there is some truth to this..

Obviously I'm generalizing, as response to tickling varies a lot from one individual to another regardless of sex, body type, race, age and most other physical factors, so this topic centers only on broad statistical tendencies. And if I mistook randomness for a pattern, please correct me.