When I was a kid (like 6th - 7th grade maybe) the big new sex trend was the '900' number. I don't think they were even 900 numbers then, I remember the prefix being something else... iirc. (wait- I think I just remembered- they were called 976 numbers back then, at least in California I believe)
But still, the greatest perversion to which we kids knew to be real (it was on the local news one night, ironic since they had it on there to prevent! children from learning about it) was that one of the sex phone numbers was a 'sex with Santa Claus' line.
And yes, Virginia ~of course~ we called it.
And sure enough- it was just like the regular Santa Claus 'pay calls' you could make back in those days- but this was Santa talking about you sucking his dick and what the elves were doing to each other and shit.
I am not making this up, and as far as we kids were concerned, this was like a sign of the coming apocalypse. I mean- you can call a number on the phone- and the person you spent so many years waiting for every X-Mas Eve with the milk and cookies and all- is on the other line telling you about what it's like to have sex with him?
Anyways, heh:
I went to a Christian Jr. High for the 7th grade- and once when I was in the school office I fucking called that number because I was gambling I could get away with it. It worked, so I hung up and called one of the regular 'hot ladies' or whatever numbers and listened to like, 10 solid minutes of it. My fundamentalist evangelical Christian Jr. high school that was. (I didn't want to be there, does it show?)