Yes it clearly says incest patch, but after reading the requirements you have to go masturbate twice in your room.. this randomness for actions is what I hate in games. Especially when their is a time limit if you do not have a time limit than you have time to experiment with doing other things but stupid idiotic time limit games you do not have time to experiment so finding the scene is near impossible as you think 'Ok I may need 150 affection.. nope not it so maybe I need 200.. and this just keeps repeating until you lose by running out of time!'. Never MIX time limits with random actions to accomplish something that is just plain stupid!
So what you're saying is... "Hey, I need about 100 affection for any other character, but maybe I need 150+ for just this one?!".
It's not that I'm necessarily disagreeing with you, but this one is hardly a reasonable thought.
Masturbating in your room is at least somewhat related in triggering *some* sort of event with your sister/mother, who are somewhat likely to walk in on you during that. So it's not like it's entirely random either.
I haven't played the game in a while, so I'm not sure if the game does a good job of hinting at this (like having them walk in on you in the beginning, to show them doing it in the first place), or at least giving proper feedback after masturbating the first time.
The second case I'd agree with you, as having actions that you have to repeat multiple times without showing signs of progress are... bad. As repeating something over and over without having any idea as to if it's even doing something is... not exactly fun, I'd argue.