The SparkMatch (sparkmatch.com) personality test seems to be a variation on the Myers-Briggs Type Indicator, which classifies people on four independent dimensions, to result in 16 distinct personality types. SparkMatch assigns each user one of 16 gender-specific descriptors, based on the dimensions of:

The registry of Everything2 users with SparkMatch profiles can be found at SparkMatch Registry.

    Male types:
  1. Rolling Stone - Independent Good Love Taker
  2. Lone Ranger - Independent Good Love Provider
  3. The Pizza-Boy - Independent Good Sex Taker
  4. Playboy - Independent Good Sex Provider
  5. Conquistador - Independent Evil Love Taker
  6. Backstroker - Independent Evil Love Provider
  7. Iceman - Independent Evil Sex Taker
  8. Fratboy - Independent Evil Sex Provider
  9. Breadwinner - Dependent Good Love Taker
  10. Boy Scout - Dependent Good Love Provider
  11. Quarterback - Dependent Good Sex Taker
  12. Adolescent - Dependent Good Sex Provider
  13. Senator - Dependent Evil Love Taker
  14. Romeo With Monobrow - Dependent Evil Love Provider
  15. Squid - Dependent Evil Sex Taker
  16. Furry Dildo - Dependent Evil Sex Provider
    Female types:
  1. Pink Princess - Independent Good Love Taker
  2. Mermaid - Independent Good Love Provider
  3. Librarian - Independent Good Sex Taker
  4. Playgirl - Independent Good Sex Provider
  5. Drama Queen - Independent Evil Love Taker
  6. Angel From Hell - Independent Evil Love Provider
  7. Vixen - Independent Evil Sex Taker
  8. Seductress - Independent Evil Sex Provider
  9. Girl, Interrupted - Dependent Good Love Taker
  10. Pure Mountain Stream - Dependent Good Love Provider
  11. Co-ed - Dependent Good Sex Taker
  12. Cheerleader - Dependent Good Sex Provider
  13. Battleaxe - Dependent Evil Love Taker
  14. Mistress - Dependent Evil Love Provider
  15. Deviant - Dependent Evil Sex Taker
  16. Porn Star - Dependent Evil Sex Provider

I, a "Rolling Stone" type, got a 100% match with a "Pink Princess" - the female cognate of Rolling Stone. Other 90% and higher matches were "Girl, Interrupted", "Drama Queen", and "Angel From Hell" - all differing from "Rolling Stone" on only one axis. (I have seen only ONE "Librarian" on SparkMatch; if there were more, I expect they'd be high-percent matches.) The lust/love chart and age difference also seem to play a factor in the percent-match algorithm.

Update: SparkMatch is down "for a while". I will be eyeballing it from time to time to see if and how it's changed.