If you look to the research you find that many of the studies do not observe men and women equally. For example “taking frequent selfies" is considered narcissistic in men. However, it doesn’t contribute to female narcissism, because its “normalized". Having “Multiple sexual partners” is another factor that implies male narcissism, however doesn’t for women because its “normalized". “Spending too much time in front of the mirror" is considered narcissistic for men , but not for women, because its “normalized”. “Buying too many clothes” is narcissistic for men, but “normalized” for women. Men who “show their skin" are narcissistic, but that's “normalized” in women.