Some thoughts:
1. Is this more common in silicon valley than elsewhere? (I've never seen any remotely similar male->female sexual harassment in the non-valley places I've worked)
2. Is this more common among high-powered people than low-powered people (seems definitely so)?
3. There's definitely a double standard here. I once worked (in tech) with a good looking former male model. There were many very suggestive comments made to him and about him, and they made him feel obviously uncomfortable. Of course, the women making these comments did so pretty openly and with humor, as female->male is not really considered wrong for sexual harassment.
4. Obviously some of these remarks are worse than others. But many people do end up dating and marrying their coworkers (Bill Gates, Sergey Brin, Phil Knight...). I think there is not a black-and-white line for suggestive comments to people you are connected with at work. The line is thick and grey, but wow do some of these guys not have any self-awareness.