Does straight peple don't exist?

[Strange]

4 minutes ago, arnold3000 said:

could it be said that heterosexual people have no sexual attraction to other men but there is some other attraction and the pupils expand from this?

Without seeing the details of the study (and knowing a lot more about what sort of things can cause pupils to dilate) I couldn't possibly comment.

You might be better off spending some time tracking down some proper information; if not the original research then articles in science magazines/websites, which might have better information.