[Other] How many of you never get any feeling in your stomachs on drops?

Everybody always talks about butterflies in their stomach on drops but I only get that on some small flat rides like the boat.

For me the only thing I feel on large drops is pressure. Even my wife gets the butterflies and sometimes I'm jealous of it.

So why do some feel it and others don't? Is it to do with anatomy or blood flow differences? Is it differences in the reaction of sensory nerves?