I have a friend, younger than me, and the perfect model for "the dumb blond". She is actually very smart but not about dating. She NEVER gets the last name (and sometimes not even the first) of men she goes out with after meeting on an online dating site.
I tell her that's insane. I won't meet a guy until they tell me their last name and I can Google them.
She still does not ask. After 5 years of advising her! She is beautiful, tall, blue eyed, and blond. She gets tons of hits.
I told her if a guy won't tell you his last name you are wasting your time. He's already a liability. Honestly, Dating is not safe if you aren't smart.