Thanks for all the responses everyone.
I had a feeling that trying to tease apart social conditioning and genetic conditioning could be a bit of big subject to broach, it's not as if social/biological scientists haven't been trying to do similar for years after all! However I thought it'd be good to see what the femeinist perspective is on it all.
Buffy - I'll head over to relationships to gauge opinion when I've plucked up the courage, but thanks for your words. You're right of course about being happy and fulfilled. I believe she is, although having two children and being a SAHM is, I think, more effort and stress than I get going out to work everyday. I think I've been looking for as many reasons as possible to try to understand why we've ended up this way and the net I've cast has included feminist theory which has piqued my curiosity. I may be assuming things are more complicated than they really are...
Basil - I hope you're right about the socialised bit, it'll make fixing things easier (only relatively of course, a major upheaval of society isn't an easy thing to do I'd imagine). RE: The sex bit, I've always thought she enjoyed it, but I've seen "When Harry met Sally" and I'm not naive enough to know that I'm quite gullible. The paranoia raised by ongoing rejection doesn't really help with managing an objective appraisal of our relationship either. Thinking about it, counselling could be an option if only for that reason. The "helluva a lot" bit is what worries me, I'd be gutted if I found out she had a cr*p sex life and didn't think I wanted to know.
I have tried to have a conversation about her feelings several times, it usually just comes back to the tired/stressed angle. I'm not sure if there is anything else underlying these, weirdly she's quite happy to talk about her concerns/feelings regarding her family and friends, but when I turn the conversation round to us, there doesn't seem to be anything she'd like me to alter about my behaviour. The housework, parenting etc... when I'm at home is generally split evenly. When I get home in the evening I figure she's spent most of the day looking after them so I'll take over the feeding, bathing, cleaning and most of the bedtime duties. Weekends I try to let her have a lie in and generally get the kids up (she's not as much of a morning person as me!). She does take ownership of the shopping, but that was a choice she made and I have offered to take over that side of things. Cleaning/laundry/household chores are blitzed at the weekend mostly by me, but she keeps on top of the smaller jobs during the day when I'm at work. I think we do a good job of equalising house/family work and I've asked if I can do more to enable her to have more time alone/in bed sleeping, but to no avail. RE: Her career, she has my full support.
RE: Sex, I have in the past assumed PIV was on the cards (to my shame), but have made it clear that it doesn't need to be and her happiness is my primary concern. Maybe my past behaviour is the issue here? Food for thought.
Sigmund - Thanks, made me smile! Rest assured the monastery route isn't an option. There are other more extreme options open but religion is one that I've explored and rejected previously. You may be right about the redemption thing though, I've made some pretty stupid assumptions that have influenced my behaviour in a way that embarasses me now in retropsect.
Amanda - I like your optimism, although the social aspect overiding the genetic aspect raises another aspect I hadn't considered previously. This just gets more and more complicated! It reminds me of Orwell's 1984, the whole doublethink stuff and the fact that we're all a product of our society and can't ever really be objective about ourselves, or each other. Heavy stuff that makes my head hurt.
That's an even longer post, apologies again.