Hiya, I'm Lightfield. I have a problem with genetics, I'm too obsessed with them. I make people knock up a variety of people to see how the offspring will turn out, I've got two sims with eight illegitimate kiddies each. I even had a gay guy "inseminate" a girl because I was fond of his genes and he seemed like someone who wanted to have a kid that looked like him.
I also have this romance-problem. It's just too hard for me to make my sims settle down or even take romance seriously (one of them who actually does, though, is poly, and for some reason I love playing with him and his partners even though I can feel quite different about monogamous partners), I also find it hard to play with nuclear families. I rarely let partners, even married ones, move in together. Many of them have open relationships. I do my best to have my sims have really diverse lives, and I succeed except for that one thing. So many of my little guys 'n gals prefer to woohoo with strangers or friends instead of having romantic relationships, and even though that is good and well, things get a little... I have sims that woohoo with the parents of their half siblings. I have siblings and parents and their children woohooing with the same sims. It happens a lot because there's only so many townies to choose from. I have two siblings that have a half sibling that's also their niece. And so on.