Could you address the final issue that you bring- that sleeping with women damages their ability to have long term relationships?
You made a fairly convinving case that emotionally, assuming you are going to flirt and go out and attract women, not sleeping with them isn't doing them any favors.
Maybe we really shouldn't be going out and flirting with most girls (excluding the ones who need an emotional escape or similar i guess) from an emotional standpoint?
More importantly though, how do you justify flirting with girls then sleeping with them, knowing it damages their ability to have long term relationships? This bothers me more than the emotional aspect.