Her tease is your test: women play “hard to get” not only to boost their sex appeal but also to assess your level of commitment, a new study in the European Journal of Personality reveals. They want to know if you’re in it for more than casual sex, says study author Professor Peter K. Jonason. The more you show your willingness to accept the challenges of the chase, the more likely she is to think you’re seeking a serious relationship. So don’t be discouraged by these tactics: she sounds busy, she’s hard to reach, her availability is limited, her initial interest seems to fade, or she seeks your attention and then ignores it.