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In the same work you quoted. I should have (for the sake of clarity) pointed out that he believed the only non sinful act was that of procreation. Sex for any other reason he considered a venial sin.

Marital intercourse for the sake of procreation has no fault attached to it, but for the satisfying of lust, even with one's husband or wife, for the faith of the bed, is venially sinful; but adultery or fornication is mortally sinful. Moreover, continence from all intercourse is even better than marital intercourse itself, even if it takes place for the sake of procreation. But even though continence is better, to pay the dues of marriage is no crime, but to demand it beyond the necessity of procreation is a venial sin, although fornication and adultery are mortally sinful.

Slightly off topic, but I REALLY wish there was a searchable online database of Augustine's (and others) writings. Would make things easier.

Some of Augustine's views came from his past association with the Manichean's (spelling is wrong), and his past lover.