I'm Pansexual so these terms don't mean much to me...but...
In my experience, if a partner is attracted to a specific "sex", then they may not be too happy to continue a relationship with someone when that person no longer represents the sex they "fell in love with".
English-gay men are attracted to men and can be as close-minded as women can be about there husbands. There are exceptions for every rule! Feel free to interchange men and women.