I already went over this above. His banter with Cassandra isn't indicative of anything, because again, it's a joke.
If the line being drawn is "he likes having sex", then a good 99.9999% of the world's population is "sex hungry". But then if you're going to dilute the label that much, why apply it at all when everyone fills it?
As Zobert pointed out liking sex doesn't make one sex-hungry. It's the fact he CONSTANTLY talks about it, CONSTANTLY talks about wanting it, frequently makes sex jokes, and frequently acknowledges he's slept with countless people that makes him sex hungry. Sure, he claims to go monogamous for the Inquisitor, but even then that doesn't change the facts.
If you get on a train once a hundred other people have ridden it, it's not exactly an "exclusive" train, even if you're the only one on board. Catch my drift? Good.
I'm really tired of seeing the media, particularly game media, pushing polygamy and promiscuity and the "norm" whereas monogamy, loyalty, and moderation are viewed as "outdated" or "undesirable", or at best "temporary". It doesn't make for good writing anyway if your character's only real calling card is that they really love sex. Might get a few laughs on a comedy show, but not in a serious fantasy RPG from a writing team that would've been ashamed of this same script 6 or 7 years ago.
Sure, plenty of the characters profess their undying singular love to the Inquisitor in the right circumstances, but some, especially ones like Isabella, Zevran, Sera, or Bull, have been having romps and flings countless times more and will continue to have them in the future. At least with Isabella and Zevran they seemed reluctant, as if they felt they weren't getting enough emotional fulfillment. Sera and Bull are just "lol its ok be urself" without any form of conscience or the inevitable repercussions of having dozens of romance partners. It's unrealistic as could possibly be.