I would change the description to "Stories with a very long build up before anything sexual happens, outside of flash-forwards."

Great idea!

honestly this is a pretty good idea, i'm surprised it's not more popular

My best exemple would be #594702 | I will make a single mother my wife 1 | 47,114 , the first sexual iniciative there only happens at page 36

Such a shame no one gave this it's due attention. I think a good bar to set would be like 30 pages before the first sexual activity like seeing each other naked or having any form of sex.

Define what is the lower limit number of pages to be labeled as such.

As much as I want to say this could just fall under the story arc tag for contrarian reasons, I want this to be its own tag. It reminds me of the "late sexual content" tag in visual novels

##551025 | Oyasumi, Okaa-san I | Good Night, Mom I | 17,978 My fav.

An alternative description would be “edging the reader instead of the characters”