Personally, it all depends of what build you are going for, I personally went for a focus on penetration so the "better at sex" was good! Yes it gives you drawbacks but overall, the drawbacks can be overcome pretty easily with the right items, and even without them and with a build focused on eros or XP, you can pretty much be guaranteed that the positives outweigh the negatives, so it's definitely worth it! I also did a run where I took all of the buffs from Sophia I could, and honestly? It overall made things easier since I was now able to "out-fuck" a mimic with ease even while having a weakness for kissing, so, i hope this helps!
Hm alrighty. I'm running an allure build with no particular focus aside from making use of Vivian's perk since it's convenient.
Like 40 allure/30 luck being the main stat investments so far. I wound up taking the lucky pocket watch and just trying to get the most value I can long-term, though I imagine trying to get her other perks and stuff will be way harder than the first time, which I still JUST BARELY beat on the first attempt with 1 spirit left. Thanks for the info though.