The best matches for family life (aka maintaining a home and having children) require SP being present as well as both partners being in the same flow. This way, SP matters will be properly taken care of and both partners are on the same wavelength about it.
Tier 1: So/Sp + So/Sp, Sp/So + Sp/So, Sp/Sx + Sp/Sx
Tier 2: Sx/Sp + Sx/Sp
Tier 3: So/Sx + Sx/Sp, Sx/So + Sp/Sx
Tier 4: Sx/So + So/Sp, Sp/So + Sx/Sp, Sp/So + So/Sx, Sp/Sx + So/Sp