Hi DavidWhitman,
I finally figured it out why my sims couldn't propose marriage to each other, I looked on the guide here and found out that my by my female sim having the family oriented trait for some reason its harder to be proposed to or propose marriage to her boyfriend for some reason. I wanted to do everything the old fashioned way in the right order - be boyfriend and girlfriend, move in together, then have the guy propose marriage to become fiancees then start having children after they get married. I had to enable cheats just to remove the family oriented trait for her, as soon as I did that I started the romantic interactions and sure enough I had him propose marriage to her and then become finacees and then have a private wedding and now they are husband and wife. Then I put back the family oriented trait so she can fulfill her lifetime wish and start having children, she needs to raise 5 from babies to teenagers. I never knew that by having that trait that the option to propose marriage would never come up. Her other traits besides family oriented are absent minded, can't stand art, hot headed and light sleeper.
As far as a job goes I think she'll be busy enough just staying home raising the kids while her husband goes on to become world renowned surgeon lol!
Thanks so much for your help