As far as we're aware, they're all straight.
no they are all straight
They are all straight.
They are all straight.
Yes, it happens all the time. But the members of One Direction are all straight.
He is definitely straight - as is one direction.
He is definitely straight - as is one direction.
No he is straight like all the others in the band.
Harry, Louis, Niall, Liam and Zayn are all straight none of them are gay.
No member of One Direction has commented that they are homosexual. It can be assumed, therefore, that each member is straight.
In maths, a ray.
A straight angle