The ache of marriage:

thigh and tongue, beloved,
are heavy with it,
it throbs in the teeth

We look for communion
and are turned away, beloved,
each and each

It is leviathan and we
in its belly
looking for joy, some joy
not to be known outside it

two by two in the ark of
the ache of it.

Denise Levertov

http://www.poemhunter.com/poem/the-ache-of-marriage/