That is wrong.
No sexual Task is needed, at least if you dont count a slap as a sexual task or a wedgie
Its simple like this:
Tybalts Pictures 1 Point (must do that)
Gay Guard Catcher 1 Point no matter what you do for the MC
100 Beers 1 Point, just dont forget to click on the beer cooler in the freee roams, and thats it.
24/7 Dildo 1 Point, only refuse it twice at max, safe point
Sexy Car Wash, Point either way for both
3 Slaps, easy, just give Cammy and Mona the underwear before and than ask them to slap you, win 1 Point
Alpha Prank, put the condom in Dawes Shaker, your Point.
Buy the Wedgie at Magnar no point Derek (needs 2 $$), and the Hellweek win for MC.
All the other tasks dont matter anymore at this point.
Like this the MC already has 8 Points and Derek cant get more than 7 anymore. No sexual task at all.
So no need for the cum-petition, no need for the cock sign or Jade fuck alltogether, you can even skip to buy the wedgie so Derek doesnt get the point and will still win the Hellweek.