I don't believe that anyone is 100% str8 all the time. Everyone at one time or another has had gay thoughts, in my opinion at least. But to the original question I would get fucked in the ass before sucking a cock.
What a curious thing to say. Since I am 100% gay, all the time, it's easy for me to imagine that other people could be 100% straight.
I really do wonder about people who do that projection thing.

jeez...
Google this word...
Straight puh-leezeeeee
Just be sure that YOU know the difference, too, arliss.
"I have sucked a coupla cocks before, but won't do it again, I prefer pussy" to me sounds like 100% straight.
"I would do either one if given the opportunity" sounds like bisexual to me.'
"I will only do people of my own gender" sounds 100% gay to me.
Some experimentation is normal.