Why do samurai have 2 swords?

The main reason samurai wore two swords were social in nature. A brief reminder: katana is already a backup weapon for a samurai on the battlefield. The main weapon is a long-ranged bow, or a powerful weapon like a naginata or a no-dachi (an even bigger katana).

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Is there a straight katana?

It's called a chokuto, which means "straight sword." Katana vary in curvature for many reasons, due to usage, period, fashion, and even plain old user preference. That's it. Why are katanas so sharp? Katana-makers use two types of tamahagane: high-carbon, which is very hard and allows for a razor-sharp edge, and low-carbon, which is very tough and allows for shock absorption. A sword composed simply of one kind of steel or the other would either dull too quickly or be too brittle.

Also, how does a gravity knife work?

A gravity knife is a knife with a blade contained in its handle, and that opens its blade by the force of gravity. The gravity knife uses a button, trigger, or fulcrum lever to release the blade from both the open and the closed positions, and may use a side-folding or telescoping (out-the-front, or OTF) blade. Are swords illegal in Japan? Swords that are not produced by licensed smiths (including all machine-made swords) are prohibited for individuals. Japanese military swords are legal in Japan if they were made with traditional materials and methods, as swords produced by such methods are not seen only as weapons but also as works of art.

And another question, what were female samurai called?

Onna-Bugeisha "Onna-Bugeisha", literally meaning "woman warrior", these samurai women were trained in martial arts and strategy, and fought alongside the samurai to defend their homes, families and honour.