All the sex training scenes were replaced with a single still image and brief text description, for the fairly obvious on-reflection reason that they were scenes you'd have to play over and over again in order to get your girls' stats up. Yes, the scenes were better then- once. Having to go through them over and over again would just make you very tired of them, especially as they were unskippable while you held down the CTRL button and waited for the bar to fill.
There's an argument to make that the scenes should have been kept to play only the FIRST time you train each girl with a new sex action, and switch to the still image for subsequent repetitions, but that would still be fiddly and adds some arguably needless bloat to the game's size. Ultimately the swap was a simple and efficient change, and the game still has plenty of other sex animations to enjoy anyway.
