"Straight" yeah, okay....if you say so

Am I the only one who gets annoyed by girls on here that post "I'm totally straight but...(insert vividly detailed girl on girl fantasy)"? 
I mean, am I wrong in thinking that's weird? Why don't they just say they're bi-curious??? They certainly aren't straight... 
Straight means to like, only, the opposite sex, both romantically and sexually. So, if you have a serious desire to have sex with a girl, you are not straight! You may be heteroromantic, but you're not heterosexual.