This may be greatly affected by masculine people being less inhibited by social norms for expressing their desire, being more aware of their sexual desire or succumbing to the expectations of their cultures. When feminine people employ tactics to show their sexual desire, they are typically more indirect in nature. On the other hand, it is known masculinity is associated with aggressive behavior in all mammals, and most likely explains at least part of the fact that masculine people are more likely to express their sexual interest. This is known as the Challenge hypothesis.