When it comes to the topic of pre-WW1 attitudes in Austria (and possibly elsewhere) toward sexuality, Zweig is pretty libertine.
Though he seems to hate what the world of 1940 has become. He praises the lax and open views of sexuality and female empowerment.
He states,
The present generation has little idea of the vast extent of prostitution in Europe before the world wars. While today prostitutes are seen in big cities as seldom as horses in the streets, at the time the pavements were so crowded with women of easy virtue that it was harder to avoid them than to find them.
He goes on to give a warm nod to prostitution allowing for an avenue to direct extra-marital 'energies'... and the states approach to sanctioning prostitution.
The official attitude of the state and its morality to these murky affairs was never really comfortable. From the moral standpoint, no one dared to acknowledge a woman's right to sell herself openly; but when hygiene entered the equation it was impossible to do without prostitution, since it provided a channel for the problem of extramarital sexuality. So the authorities resorted to ambiguity by drawing a distinction between unofficial prostitution, which the state opposed as immoral and dangerous, and licensed prostitution, for which a woman needed a kind of certificate and which was taxed by the state.
I'll have to take his word on this. Though I disagree entirely with the idea of needing to vent sexual energies somewhere. This whole chapter (titled, "Eros Matutinus" seems woefully ignorant of a thomistic view of sexuality.... which is understandable. But, I would hope that even reason would have guided Zweig away from some of his conclusions. He views the modern (1940s) approach as so much the better because one is able to have sex outside of marriage and the degree of scorn directed at those people is significantly diminished, across all classes. He sees something imbalanced about a person forgoing sexual relationships even for religious purposes. Fine enough... but did he really have such a poor understanding on appetites in general? Didn't his own experiences show him that unfettered indulging does not lead to a healthy satiation.
He comments on how smut magazines and books would completely leave when a society 'knocks down that fence' of morality. Oh come to the 21st century, Zweig and see how wrong you were.
Some of his views and criticisms of that pre-war time do make sense. For one:
Here again we can detect dishonesty, for the bourgeois calendar was by no means synchronized with the rhythms of nature. While nature brings a young man to sexual maturity at sixteen or seventeen, in the society of that time he was of marriageable status only when he had a 'position in society', and that was unlikely to be before he was twenty-five or twenty-six. So there was an artificial interval of six, eight, or ten years between real sexual maturity and society's idea of it, and in that interval the young man had to fend for himself in his private affairs.... or 'adventures'.