I've used the cas-cheat that citysimmer mentioned to give my gay & lesbian couples genetically-related children. I believe you can also use MCCC to allow same-gender pregnancies*, but I think it works on a class-basis, not an individual basis. If it interests you, you can check out the details
here - look under Documentation.
eta: corrected word (pregnancies, not babies!). Realized while doing so that you said you didn't want the men to go through pregnancy ( :lol: --not telling you my pregnancy-stories, no I'm not!), so the CAS cheat's probably what you want anyway. :smile:
I've never tried it, but you might be able to use aging cheats to age the CAS-toddler down to a baby. MCCC has aging cheats built-in, but I've not tried aging down.