@awnlee jawkingUsually, that's more of a story motif. So it can be used to write a wish-fulfillment stories, yet usually that's the source of the story tension and conflict, protecting the most vulnerable women, especially those he's taken under his wing.
When I write those types of stories, I also include a couple who have no desire to sleep with the male protagonist, yet he still elects to protect them anyway, as the stronger the group overall, the better for everyone's survival, so it's more quid pro quo rather than their 'breeding potential' at stake.
Yet, I often go out of my way to address the least common story elements in any story, just because those are the least common story elements.