Couples Seeking First-Time Marriage:

1.  Young & in love
2.  Conventional & ready
3.  Pregnant & pressured
4.  Older & independent
5.  Him, her & them
6.  First love, then kids, then marriage

Couples Considering Remarriage:

7.  For one or both due to divorce (no kids)
8.  For one or both due to divorce (with kids)
9.  For one or both due to death (no kids)
10. For one or both due to death (with kids)
11. Reversing their own previous dissolution

Low-Risk Cohabiting Couples:

12. Pre-wedding convenience seekers
13. Ring-less biological parents
14. Trial marriage practitioners
15. Un-married benefactors

High-Risk Cohabiting Couples:

16. Relationship game players
17. Relationship evolutionists
18. Marriage-phobic resisters
19. Habitual cohabiters
20. Anti-marriage advocates

Source: Jason Krafsky