You can play this game where Lisa has no sex (beyond making out in the back seat). Player choices determine if Lisa has sex with Alice, Tim, Tom, or any combination therein. If things are moving too quickly or if Lisa is having sex with someone you don't want her to, then that is because you made choices that caused that to happen.
Which path are you on that puts Tom or Alice over Tim when it comes to Lisa?
Ok I don't think you are seeing what we see. The idea in the game is for Mom to chose her favorite son. The game starts out and Mom has run off to the Mall with Tom. She has left Tim home all alone. Mom and Tom act like boyfriend & girlfriend while at the Mall. Making out and letting Tom feel her up ( sort of hints at Mom giving a Blowjob if I remember correctly). Mom comes home and now it is Tim's turn. But how does Mom spend her time with Tim? She argues with him and slaps him. Instead of fixing the issue with Tim, Mom spends more time with Tom letting him feel her up and kiss on her. Did Mom finally go to see Tim and try to fix things? NOOO she goes up and watches Tom take a shower. Would have went in and joined him if Tim hadn't of come out into the hallway.
Tim leaves. Does Mom go looking for him? No she could care less. Tim does finally get a Hot scene with the Aunt(or cousin). But while Tim finally get's his hot scene. Tom is getting one as well with their Teacher(or her daughter).
Tim comes home and finally gets a hot scene with Mom. But so does his Cousin. Hell she got just about as much time with Mom as Tim did.
Hell the kid from school that Tim beats up got more hot scene time with Mom then Tim has gotten.
Tom - MOM, MOM, MOM, MOM, Teacher.
TIm - Aunt, Mom
and this is playing for Tim to win. But the game is heavily tilted in Tom's favor.