In that case, I won't recommend The Bad News Bears to you (moot since you have seen that one almost certainly). Anyway you are right as far as reality is concerned - women can't compete in men's sports. You probably remember when John McEnroe got in trouble for stating the truth about that:
"if Serena played on the men's circuit she'd be "like No. 700 in the world."
That's actually one aspect of what makes Fast Break a comedy - the joke that Swish, or any other woman, could kick ass in Men's college basketball or any other level.
Yes that's right, she was mistaken about his intentions for visiting the opium den (so to speak) -- he just wanted a break from the pain of consumption. Yes, he took the luck element out of the stud game and got to hook up with Faye Dunaway for his effort.