If having sex has become nothing more than a chore because you are just too exhausted for sex, and the usual drive for intimacy is missing, it may be because of the hectic schedule of your daily life. If you are the breadwinner and sometimes get home late in the evening, sex may indeed be the last thing on your mind.
A stay-at-home mom, busy with kids all day, may also find that tiredness can dampen any ideas of intimacy.