This applies to dating/courting etc, not hydration. Only counts people you know in person, not people you've 'met' online or through mediums like TSR.
Scale goes from 1 - 10.
1 is least thirsty.
10 is most thirsty.
I'd say 10 is demanding/requesting nudes/videos, blatant use of innuendos, lots of sexting etc.
Are you thirstier online or in person?