I'm aiming for a third of my life to be 30 years and yes that would be a long time to spend with a pleasant doofus when there were debonaire doctors wittering in my ear.
Neelix blew it in Elogium by freaking out when biology finally triumphed and Kes was ready. Wasn't he ever curious about her puberty, reproduction etc..? I bet he thought he was being respectful by never asking her to explain her not readiness but to her it would have seemed like lack of interest.
You should absolutely know the biology of your girlfriend