It depends what you mean by attraction, people who identify as straight can appreciate if someone of the same sex is good looking.

Maybe I have never experienced proper attraction then, I know a woman who identifies as a lesbian who stopped watching a show because the lead male role changed and she didn't think the new one was good looking!

And then there are different types of attraction. Physical attraction is different from being attracted to someone's mind. I fell for a guy online a few year's ago and I hadn't seen him, I just found who he was and his intelligence/what he believed attractive. So I am wondering what you mean by attraction.. it is complicated.