Why not? As long as it's not official. Bing was/is known as "the porn search engine" which never seemed to bother Microsoft.

I think the difference is that OpenAI wants to sell their text generation services to big companies that will show AI content directly on their platforms (think chat support bots), whereas Bing is selling eyeballs to advertisers (who also don't want their ads shown alongside porn by the by).

If OpenAI has the reputation of serving up porn to whoever asks, there's no way the Walmarts of the world will sign up.