Another bisexual mum and wife here, very interested in joining the group mentioned by Little Oyster. I do think your bisexuality can be very relevant even if you are in a monogamous relationship with a man. It's a relief to find women in a similar position with whom it'd be possible to share and discuss possibly common issues.
I don't think all bisexual people are the same it terms that they are all equally attracted to men and women. My wiring is definitely faulty 
and very inconvenient for me, in terms of me falling in love with men but sexually feeling more fulfilled with women :(. I mean I'm very lucky that I have a passionate and satisfying sexual relationship with my husband, but it doesn't stop me from desperately missing sexual experiences with women.
On the other hand, if I had to only sleep with a woman/women for the rest of my life, I know I would be okay, I wouldn't miss men desperately in a sexual sense. 
However, even hypothetically I cannot see myself with a woman as a life partner, I only fancy feminine women (and masculine men, though fancy men very seldom anyway), and I find that I have more than enough estrogen by myself to have a smooth relationship with a woman, even close friendships with girlfriends I find overwhelming sometimes, I need to be balanced out by testosterone, and in general I find friendships with couples and men more relaxing, though I'm blessed with some great friendships with women. :)
So even though I'm happily married I forever feel like something is missing (sexually), I try not to dwell on it but I am still often attracted to women, and when I suppress it for too long I start getting lots of erotic dreams featuring girls :/