It's not just the left. Even here on FR, men who are sexually promiscuous are cheered (see all the "not guilty" and "I'd hit it" threads). Seems kind of hypocritical to criticize the women and not the men.
It’s the man’s “wiring” and “role” to pursue women in a sexual manner. It’s the woman’s role to be the “gate keeper” and control that powerful drive in the men by channeling it into building strong families.
Of course, the left, following their “spiritual father”, want to pervert women into the pursuers and then we have absolutely no gate keepers, and the family as an institution, God’s first human institution, is destroyed.