Earlier quoted context omitted.
They don't want to be a porn site. The problem they have is that the porn content drives away advertisers and non-porn related contant. So they have to steer away from porn, but wherever they draw the line there are going to be people testing the line, and there's an audience for it. So the compromise they've clearly come up with is they don't allow porn, but if you happen to be sexy wearing practically nothing, that…
What's funny is that they insist on pretending that these streamers aren't trying to sexualize themselves. The streamer that caused this blog to be written basically uses her twitch channel as a front to sell her nudes on another site. If people want to sexualize themselves for money that's their business, the problem is they keep trying to find loopholes in the conduct policy to transform a site about videogames tha…
As long as the content on Twitch isn't sexual, I don't think it matters to Twitch (or advertisers) if it's serving as lead-gen for something that is sexual. Content produced as lead-gen can be valuable for its own sake.
(See also: every YouTuber who provides some professional service for a living, and films themselves doing that service as a way to make people interested in employing them, such that their channel doubles as a professional portfolio of their work.)