Complex sentence: For this reason, in the mind of the sufferer, love and sex cannot be mixed, and the man is reluctant to have sexual relations with his wife, for that, he thinks unconsciously, would be incest.
Split into simpler sentences: 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, that would be incest.