Mamma, yes i think it is normal to feel like this. I have been married 8 years and have two beautiful sons, my dh is the perfect husband but i think there is something lacking, i am the type of woman who thrives on the thrill of lust, the first date the chase etc, which you no longer get after so long with a partner.
This doesn't make me a terrible person. I look after everybody in my life, i am a model home-maker, directors wife, i look nice on his arm say all the right things, nuturing and caring mother etc. I protect my secret by not pretending to be the above but embracing all the aspects of my life so my dh would never think i am seeking lust elsewhere, if you see what i mean.
I think when you have affairs and it directly impacts your family and partner then yes, it is bad, either be more clever about it or don't do it.
my father taught me the tricks of the trade and i have to say i have never felt more complete as a person, i do not love the other man, i may in the future but at the moment he is providing me with something my dh will probably never be able to again. We only have one life and as long as you are careful not to fuck it up for other people i.e getting found out, then i don't see what the problem is.
right flame me ladies!!!