True enough, it'll definitely be distended and have signs of visible arousal during the moments that someone is having vaginal intercourse. No long-term changes after arousal does down, tho.
Ah yes, obviously this is true. I've had to circumcise myself every 7 years as a result. Fortunately foreskins are useful for witchcraft, so it's kind of like a side hustle.
That's actually not true, there are quite a lot of cells in our bodies which are never replaced such as the lenses, cones, and rods in our eyes, egg cells, neurons, the hairs that detect sound in our ears, our heart muscles, among many others. The ones that do get replaced vary greatly in how long that takes or how often it happens.
They're saying during sex which yes there are physical changes to the presentation that occur when aroused. Not this bullshit sandwich effect for sure but still, they're not wrong it's just a really weird point.