@sublockIf an entry is Tagged: Stroke, but it doesn't have sex in the first three paragraphs; it is likely to annoy those who picked it based on the Stroke Tag.
Tagged: Much Sex, most people expect there to be sex in every chapter, perhaps several sex scenes per chapter. If you include the Tag: Slow, a story might have the first several chapters with no sex; but probably building some sexual tension. In a story Tagged: Much Sex, it could be possible to not have sex in some chapters, if the writer is building sexual tension, or something similar. Such as the characters going out for a romantic dinner; or the characters going out somewhere that there are consequences for having sex that they are unwilling to face, or get caught before they can consumate.
If I were to open an entry Tagged: Stroke, I would not be surprised to see sex in the first paragraph. Perhaps there is a knock at the door, or the doorbell rings; there is the babysitter, callgirl, gigolo, pizza delivery guy/gal, plumber, landlord, etc. Perhaps the person who opened the door, cannot afford to 'have their pipes cleaned' or the pizza, or whatever... SEX.
Perhaps the last paragraph states that they are lovers, and were just acting out a fantasy, or they are filming a porn scene... Any more 'plot' than that and it's not a 'Stroke Story'
It is possible to have a well written Stroke story. Perhaps the protagonist is describing being at a club, searching for a sex partner. A paragraph or two could set the mood: an upscale nightclub, a Rave, a dive bar, a high school reunion, etc. Describe the desired partner, perhaps a seduction scene; or describe the dancing and/or flirtation in a manner that builds the sexual expectations.
Time is a factor. Most readers of a Stroke story don't expect many paragraphs to be lacking sex. Foreplay, even 'mere' caressing, or detailing the removing of each article of clothing, interspersed with kissing, etc. could be part of a Stroke story. However, most extraneous details are omitted. So, you might detail some interactions (flirting, dancing, etc.) at the club; but if they leave the club, unless there is a scene of roadhead, etc.; it is just: We left the club, and as soon as we were through the door of my apartment... perhaps they get as far as the bedroom, before the sex begins/continues.
In a Stroke entry, no one should expect a plot. Presume that every character mentioned will be engaging in sex; unless they are a Cuckold, Voyer, etc. or mere 'decoration' such as the bouncer, the doorman, the taxi driver, the waiter/waitress, who is probably not named.
In a Stroke entry, there need not be any plausible reason for anyone/everyone having sex. Grandpa, a police officer, a random person in a park, a burglar, Santa Clause, POTUS, the neighbors, wizard, depending on the Tags, animals, dolls, aliens, monsters, or tentacles!
Most often a Stroke entry will be short. Perhaps you might have several chapters, such as describing an orgy from the perspective of multiple partners, each with their own chapter, or some other situation.
(Edited to change the word 'chapter' to the word Paragraph; twice.)