I think that in our culture there is this message to males that any time you can have sex with an attractive female, you should do it. But for females you always have to guard yourself against it, sort of keep sex at bay. You don't want to get a reputation, especially when you are under age.
If I only try to solve the problems I set for myself, then I'm limited by what I can conceive of. I can't solve a problem I can't conceive. But if someone else gives me a visual problem, it can be out of the whole realm of my normal practice.