Although she is technically legal, there is something a little creepy about hitting on an 18 year old.
And save the whole, "But she is legal," or "Back 800 years ago, it was okay," or "Well, girls could give birth at 13 years old." Yes, on a pure biological and primitive level, I get all of this. However, for me, its just a little weird. Even at 34, I cannot see myself hitting on an 18 year old. 25 or older is pretty much my cut-off age for dating/being with a women.
I mean, I just think to myself, if I had an 18 year old daughter, would I want a 30+ year old guy hitting on her? No.