Also when explaining whether or not you agree with this expression please define what you think "gatekeeper" means in the context of this quote. What in your opinion makes someone the "gatekeeper" of either sex or commitment.
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I think on an instinctual level, a little bit, but I think this is exacerbated by social norms.
Men are naturally inclined to want sex more because we are always ready to procreate; Women are naturally inclined to want sex at sequestered points of time when they are ready to procreate (ovulation), and sex at any other time would be physiologically useless (you aren't doing anything to forward procreation, so why waste the energy?).
Meanwhile, women are naturally inclined to want a relationship because pregnancy leaves them less able to fend for themselves, and so therefore having a partner provides a sense of security. On the other side, men are naturally inclined to be free of commitment because they can spread their genes by having children with more women.
These, however, are broad generalizations about people, taking the most logical path from the viewpoint of a survivalist, Darwinist stance. Humanity, however, has generally moved on from the necessity of "Survival of the Fittest", due to our dominance of our surroundings, and now we are involved in a "Progress of the Group" mentality.
With regards to that, monogamous relationships appear to be the best means to raising productive members of society, and therefore, should be the goal of humanity for the time being. Therefore, men are adapting to fit this role, and because they are more likely to have successful children, their genes are being selected more commonly than men of differing dispositions.1