Yes but don't forget, when the kids ask "Has son fucked mother yet", all they care about is penetrative sex. They don't understand eroticism or foreplay.
If we assume L&P's comments in Nov 2021 remain correct, we have two in-game days until first lesbian sex and three in-game days until first hetero sex, (which may well take two-three years or more in real life before updates released). And his closing comment from that post was:
"Which of course means that any other sexual practices will happen in betweewn as well!"
All from
Apollodore 's Information & Guide on page 1 of thread.
So we should start seeing Sophia directly involved in sexual acts start to happen over the rest of Friday and Saturday, to build up to the fun packed Sunday / Monday / Tuesday.