I know what you mean!! We brought a Liberator to spice things up a bit and it really helps!
It can feel that way sometimes, but durring the tww it is a perfect time to have fun and do things your own way, also helps pall the tww time.
make each other laugh. it breaks the tension. if i mention to DH around mid-day that we have homework that night, he kind of acts like he forgot during dinner. the next thing i know he comes into the room buck naked. it catches me off guard every time.