Some women do... some don't. Not all males dress/act that way so it's not really a big deal.
Honestly I'd rather have a guy act/dress how he really feels comfortable with himself even if that means it's "feminine" in some peoples opinion than a guy who walks around faking YOUR concept of "maleness". Many traditional cultures even allow for transgender individuals to hold a respected place within the community.
Feminine and masculine are completely social/cultural constructs... not so long ago in europe the MOST masculine/sought-after males often wore high heels, lace poofs, brightly colored brocades and silks, make-up, and wigs or at least were expected to have long silky elegantly coiffed hair.
Study some anthropology and history sometime. Feminine and masculine are not static.