There are several theories why boys might be simply less invested in their academic success:

Why on earth would there be more power in female sexuality? I guess, the idea of a level playing field is already scary enough for most guys to explain patriarchy. Everything beyond that is pure paranoia.

oh, let me guess, you're probably a believer in the homo oeconomicus, the rational agent who's only striving to maximize his personal utility? Cute. (For the record, the "mostly focussed on personal benefits"-thing is something I can buy into, but "rational" is generally a bit of a myth.)

Talking about comfortable narratives.... because "Institutionalized sexism? Nah, women just aren't that funny" isn't convenient at all..... Don't you know, male doctors/comedians/whatever could have no possible self-serving motivation to keep out female competition; balls are apparently a guarantee of objectivity and…

my sympathies. The things we do for love...

well, technically she doesn't leave hottie mcHot for Richy Rich; she resigns herself to a life with Richy Rich after she thinks Hottie dumped her, because their evil parents never gave her his letters or something.

I was thinking David Foster Wallace. Reads like something straight out of "Brief Interviews with Hideous Men".

Sansa is too mature already to be reckless. For the moment she's primarily focused on survival which is the smartest thing to do in her situation. There's heavy forshadowing that she will play a crucial role in LF's downfall. But for now she's bidding her time.