If you have a trait that the other gender optimizes for more in short-term, lure them by acting short-term, even if later you'll attempt to raise their oxytocin to the long-term point.

I don't like that idea. It doesn't seem right to try to get someone in a long-term relationship when they were just looking for a short-term relationship. It seems no better than trying to get into a short-term relationship with someone who wants a long-term one.