It depends on context. With woman is pregnant or post pregnant yes. If andriod like from Harem Hotel then also yes. If there is no stated reason then no.
Not unless there is a massive change in society that normalizes sex and doesn't view it as taboo. Also there would be must be away to prevent people from under 18 from accessing and playing the game.
Yes the game is still being worked on. The updates are about two a year because of how big they are and I believe that is because the developers us Honey Select.
It does not. To make it work it needs to be established in the beginning that parent remarried a partner with a child and the mc and sibling grew up together. Then it works also it in my mind will always be better then landlady and tenant.