Not everything is necessarily deliberate. For example, the medical aspect that GP referred to: lots of medicines are only tested on men, not because doctors don't want to cure women, but because it's easier to show consistent and significant results in men, because their hormone levels don't change throughout the month. Tests on women are more complicated, but therefore more important, rather than less. But they're often not being tested out of laziness and because society tolerates using men as the default. Any drug that has only been tested on men should be immediately criticised for that, but that doesn't always happen yet. Though it's receiving a lot more attention now than it used to.
Or the fact that crash test dummies tend to be modelled only after men. It's easier to have one type of test dummy, and men are seen as the default. All of these things are not done out of malice, but out of laziness.
That said, there's also plenty of oppression that is actually done out of malice.
But if you want to have an informed opinion on this, yes, you should run out to your local book seller and read some relevant books on the matter. Or order them online. Or borrow them from the library.