Do you know - I actually checked in case you were my DH writing this, but you've given me enough to realise you aren't.
Maybe if I tell you what's stopping me it may ring some bells (or I could be barking up completely the wrong tree):
1 - I am tired
2 - I am tired of always being the one who sorts everything out, that is spinning all the plates and making all the arrangements (to do things, pay for things, take children places etc)
3 - As DH despite repeated asking does not take up any slack re point 2 I do not desire him as I see him more of an extra child than an adult my equal
4 - I would like DH to not ask me if I want to go out and then expect me to sort babysitter etc - I would like DH to present me with a fait accompli - otherwise it's merely asking me to arrange yet ANOTHER thing
5 - I would like DH and I to find a hobby or something else to do together that means time together in a non household-y non-sexual way
6 - by taking note of the points above I am likely to be reminded of why I fell in love with my DH and thus desire him again
For me sex is a natural consequence of a happy relationship, it feels like to DH the relationship will flow from sex - not sure how to resolve that one.
Good luck