What shitty stuff did you discovered when you became adult?
For me, driving. Its not that driving is difficult or i'm just not able to drive. Its that there are just too many awful drivers and pedestrians you have to care about on the road.
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Shower sex.
In the movies it looks so hot, but in reality, you've got a eyes and mouth full of soap and your freezing. 2/10
Rinse your hair and turn up the temperature?
Not too mention how slippery it is.
...in the wrong places
Depends on the shower set up.
One place I lived at had accessibility handles in the shower and a grippy floor, the shower head positioning and spray options kept both of us covered, and one of those heat lights that kept us both warm for the small bits that weren't in the spray. Most other places have had issues with one person not getting enough heat to stay warm, although a special shout out to the one hotel we stayed at with multiple showerheads.
I haven't run into the lubrication issue in showers or hot tubs, but also don't use condoms (monogamous relationships with other forms of birth control). Hot tubs were not public and we were very good about the water maintenance.
You start in the shower. Wash yourselves, wash each other, tease a little, then dry off, get into a clean bed and have at it. Standing sex in the shower is mediocre at best.
You are doing it wrong.