If the resulting encounter doesn't become part of a relationship ... they feel seriously emotionally hurt.

That, Eugene, is bullshit. It could happen, but it doesn't have to happen.

Women do tend, on the average, to get more emotionally involved around sexual matters than men. On the average, and relatively to men. Women are also more pragmatic around sexual matters than men.

The idea that a woman will necessarily "feel seriously emotionally hurt" if she sleeps with someone and it doesn't lead to "till death do us part" is just plain wrong and obviously so.