Do you think that you being pregnant could have anything to do with it?

Wikipedia says about Madonna/***** syndrome: Often, the wife begins to be seen as mother to the husband—a "Madonna" figure—and thus not a possible object of sexual attraction.

For this reason, in the mind of the sufferer, love and sex cannot be mixed. The man is therefore reluctant to have sexual relations with his wife for, according to his unconscious mind, this would be incest. He will reserve sexuality for "bad" or "dirty" women, and will not develop "normal" feelings of love in these sexual relationships.

This introduces a dilemma where a man may feel unable to love any woman who can satisfy him sexually and is unable to be sexually satisfied by any woman whom he can love.