I've found that, within male-female relationships, that the male is the stable "breadwinner" (i.e., benefits, etc.). Most woman interpreters I know have a husband with a stable job and their income is supplemental.
I, also, know female interpreters who are not within that circumstance (i.e., single mother, single, lesbian).
Could it be that men seek to follow the "rules" and the women embrace a tendancy to be in a maternal, pathological role?