So I'm still struggling a bit with the Best Friend storyline. I've learned the secret of the quad party, but so far nothing's changed. Is it still just a case of continuing to raise party popularity, since I'm playing as a guy?
Once you learn the secret, you have to tell your BFF, then follow through on the consequences of that. It takes two weeks/two quad parties, then try & make every 'talk about sex' event you can afterwards.