Quoting whoknowsx:" Does it matter if SO is not your DH? My hesitation for combing accounts is... what happens if you just ... [snip!] ... have an account where we match each others dollars? I dont know. I think I would feel different if we were engaged or married."
Personally, if I were in a position where we both had decent salaries, I would have it so there was one joint account, agree on a certain amount each would put in, for bills AND for spending on both sides, things like eating out, buying stuff for the kids, that kind of thing.
Then each have a seperate savings accounts that you can dump the rest into. If it were me, personally, I would let him have access to my savings and vice versa, but it would be in MY name for long term financial security just in case, KWIM?