Sex & the Single Woman: Crossing the Line?

Today I was talking with a girl who I kind of now, but don’t hang out with a lot. As we chatted, I kept thinking about her ex-boyfriend, who I met the other day. He is super cute and a great guy. Any girl would be lucky to have him. This led me to thinking, “What if I dated him?”

This brings up the situation of dating the ex of someone who is a friend, but not very close. Is this awkward?

What is the protocol for dating a guy when you kind of know the girl? Even though you are not good friends, is it in poor taste to go on a date with him?