Men approach women in the way society is currently set up. It takes more for a man to bed multiple women than the other way around. And also, women admire qualities that can be found in men that can bed multiple women such as charisma, social skills, and a general air of confidence. Meanwhile, men value women that possess virginal-like qualities and are viewed as prizes. You want to keep the system in place in which women are considered the prize and are pursued? Then deal with the double standards that come from that.
No matter how much people dislike the facts, as long as the current model of dating exists in the West, the double standards will exist. Women seemingly want to have as much sex as possible, be excused from slut shaming, refuse to pursue men, and still want to be courted and treated as prizes. One end cannot exist without the other.