"Teenage girls in catsuits fighting cheesy, spy movie villains with various schemes that border on fap material, and which the girls are usually victims of? Who do you think we are, the internet?"
-Probably the network TS was pitched to
I mean, I've seen some pretty cringe-inducing art on the internet people consider good fap material. Look up "The Eye Sirens". It's passable for a playboy comic, but definitely not the kind of thing one should say to themselves "yep, I can fap to that." Also, Winx Club has more porn than Totally Spies. Just think about that for a moment.
Probably has something to do with appeal. Stuff like Martin Mystery, TS, and other such shows are recognizable, but not so much appealing as inspiration for pornographic content. The funny part is, I never understood why so much Simpsons and Family Guy porn exists.