Rationalism, as discussed on LW, is not particularly helpful for getting laid.

Well, if you filter out the epistemic stuff and focus on various instrumental-rationality bits like:

• Willingness to accept unpleasant or unpopular ideas

• Willingness to try things you see others succeeding with, even if they seem to be based on ideas that are absurd or impossibly wrong

• Willingness to suspend disbelief while you are doing something, separating evaluating from doing

• Observing reality to see what works, rather than imagining you are more (or less) successful than you actually are, by devising as-objective-as-practical test/success criteria in advance

• Accepting others' beliefs and worldviews at face value, without judging them "good" or "bad"

Then yeah, you will find some useful things here, though of course perhaps not nearly as useful things as studying some domain-specific materials on the topic. But the above ideas will serve you well in any domain that involves influencing human behavior, whether it's your own behavior or someone else's.