I've been thinking today that young Fen'Harel been grossly misrepresented. I think he was a rebel to be sure, but his deep intellectualism has me thinking he was more of a 19-year-old-straight-out-of-1st-semester-of-poly-sci-Marxist than a young man dripping in sexual prowess and finger-gunning random elvhen babes into ecstasy when he walked into the room. That's simply not his personality.
He was an idealistic risk taker who had ideas about how the world should be, uncompromising in how he thought the world should function, and pointedly went about achieving that future without much thought as to the fallout of those decisions. Political/ philosophical radical, cocky in his intellectual superiority.
Not the vain sexual predator fanfiction seems insistent on pushing on him. That's far more Falon'Din's domain than just about anyone else's at this point.
I'll admit the first one is closer to how I see him than the second one, but I'm not so sure.
Solas himself admits that when he was young he was cocky, hot-blooded, and always eager for a fight. I don't really think you get that full of yourself unless you're sexy and you know it, or that eager to jump into fights without also being eager to jump into... you know. I imagine he was something of a young James Potter (with a dash of one of those greaser boys from an S. E. Hinton). That on some level he thought just because he was effortlessly brilliant in school, great at sports fighting, popular among his peers, and able to talk circles around people in debates meant his ideas were legitimately the best. Until he actually put them into practice, and had to deal with the bone-crushing consequences.
That's probably just me though.