I have memory as a kid sitting down every weekend with my parents to watch a sci-fi programme on terrestrial TV, but I can't think of what it was called and neither can they.
One episode is about two guys, completely unrelated to each other, found dead on a street. The only thing they have in common is that both where carrying a business card with a web address on it. The guy who was investigating the murder typed the web address into his computer and it asked for his name. He put in his name and the screen went blank. With that, he begins to see a woman everywhere he goes, but only he can see her. The guy starts dreaming about having sex with this woman, only to wake up and find he is. The woman disappears and the guy starts getting sick. In the end the women turns out to be an alien and was killing men as they couldn't get her pregnant. Then the episodes ends.
The only other episode I remember is the investigators go into a room, and some alien butterflies attack them.
Anyone have any ideas?