Ok, said I would redo this one before moving on to a few new tropes as I wasn't really happy with how the original post turned out.
So, without further ado, here is Stairway to heaven 2.0
The Stairway to Heaven:
Look it's been 6 months, can you at least touch it a little?
No one ever has sex on the first date. Especially not horny teenagers or consenting, experienced adults. Sex isn't spontaneous you see, it's actually a highly ritualized series of events taking place over a period of in game days or weeks, or however long it takes before patrons revolt due to being blue balled. Whichever is sooner.
The reason this trope exists is that porn games often use sex as a reward in order to keep people playing. This means that sex can't all just happen at once, it needs to be spread out across up to dozens of hours of game play. It's much easier to do this if you strictly gate the activities behind stat checks and/or limit them to once a day or even a couple of times a week. There will always be a direct progression from more simple acts to more obscene ones. I mean why waste all your renders in one really hot sex scene, when you can instead spread it out over 10 different ones.
While the order of these steps isn't always fixed, they tend to fall into three basic groups, flights of stairs if you will.
First Flight:
1. Kissing
2. French Kissing
3. Light Petting
4. Heavy Petting
5. Flashing
Second Flight:
6. Handjob/Pussy Rub
7. Fingering
8. Tit job
9. Blow Job/Cunnilingus
Third Flight:
10. Vaginal
11. Anal
The second flight is the most mutable in both order and content and can also include Thigh Fucking, Butt cheek fucking, Footjob, Sensual Massage or anything else that does not end with a dick in the butt or vajayjay.
Now the length of the stairway can differ, if you're playing a VN chances are that there will only be a few steps, though they can often be spread out. DmD probably has the most pronounced progression of this type, with each day in game culminating with a new "thing" that D and F can do.
The real stairways though, they come in when you are playing a
life-sim banality simulator. Because these games are open ended players will be traversing multiple stairways at once. Generally there will be a grind to get to the next interaction, then the player is expected to repeat said interaction ad nauseam until the next one unlocks. Then the cycle continues, as scenes that were once exciting to the player soon become rote and uninteresting. In that regard it is a fascinating reflection of a real life couple constantly looking for something new to spice up their own stale sex life.
So, brilliant I guess?
Games that use this trope are extremely common. Pretty much every single banality simulator does this, though a few escape it.
Examples:
My New Life: Most sex in the game is opened up by two sets of grinding and a fetch quest or seven. Once you can visit a girl's house the progression becomes extremely standard. You start with kissing, repeat until she can start flashing you, then rubbing her, then her touching you and so on. Getting to sex will require about 15-20 separate visits, even for girls who are KNOWN to be sluts or even have slept with the player in the past. You are also strictly limited to one act per weekday, and two on weekends with ANY girl. That means with the roughly 8 or so girls who have this mechanic in the game we're looking at around 120 to 160 in game days of grinding.
Big Brother: Does something similar, but with less feedback. Lisa's route is notorious for this. Worst case was the Lisa progression from blowjobs to anal as that requires maxing out 3 different blow job scenes along with hoping the event with Kira will pop. The follow up may actually be worse though as it can take weeks in game to move on to being able to have buttsex with her while Kira isn't around. That's not all though, Ann and Alice also have their own grinds, though they aren't as bad.
Man of the House: Similar to BB, but each woman has specific stats that you need to increase, and at certain points in the game the only way to do so is to repeat the previous scenes 5-10 times.
Teacher's Pets: Lots of repetition with both D and Meghan.
Any Lesson of Passion Game: Or to be more accurate, any of the life sims.
DmD: as mentioned above, no real grind but the progression is very strictly gated. On no night to F and D move things along more than one step.
Games that do not use this trope:
Any game written by a woman. Fancy that.
Alternate image:
"So at the top of this thing I get to fuck her?"
"Nope, but you can pinch her butt for 3 seconds"