Well, while the consensus is that claimed WG bisexualityis merely a 'marketing ploy', my own experience leads me to disagree.
In addition to seeing occasional 'new' WGs out of curiosity, the vast majority of my punting is with four regulars whom I have been visiting for several years.
The married one prefers sex with men, but looks forward to occasional intimacy with other women and has done so since she was a teen. She's a milf now.
My longest serving WG (whom I have had a MFM with involving the married one) is also more male orientated, but I've known her to have been in a fairly long relationship with another young woman.
A more recently acquired regular prefers females while enjoying sex with guys. Says she could envisage marrying a woman, but not a man.
Finally, another long term favourite is equally at home shagging dudes or girls. In one amusing episode, she went weak at the knees at a restaurant we attended, when we were served by an outrageously pretty and very young red haired waitress!
A sample of four is, admittedly, unscientific; this, however, has been my experience.