It's somewhat common. Not a majority for sure. In my experience talking to other women on these topics, the non-bi women tend to be more into bi men or two men at once. I've talked to many bi women who have the double standard and no interest in bi men...and some who would not date a bi man...talk about hypocrisy.
One most recent was accepting of my past experiences and was willing to peg me if we met, but said she would never have another man in our bed (other women possible yes).