Folks you are sort of missing the point of the OP.
His complaint as it seemed to us was, people on various sites POSING as one thing, listing themselves as Straight, but contacting him/them, about Bi play
In my reply I sort of explained that, being contacted may be the other persons way of figuring out if they have that interest. And yes, If so inclined, you do not know until you actually try.
But, let's bring it back to the original question - Bi men posing as Straight