Frankly, I don't think the main concern is children. A lot of adults don't have good impulse control, and we should build systems that disincentivize harmful behavior. I'm more worried about someone doomscrolling fetish subreddits today than having to contact sketchy businesses back in the day, because of the hurdle they had to get over.

I think consuming sex content is akin to most time-wasting we can do on the internet today, and that'd be my main concern.