I really hope at some point that they bring back the In Vitro-type option from Sims 3 (I want to say it was Into the Future that added it) it would be nice to have the option of having genetics without the sims having to woohoo. Like in the case of an Unflirty sim or a non-committal sim that doesn't want to have a relationship with someone but still wants to have children that share their genetics. There are mods that allow you to do this but it would be nice to have an in-game option.