Aye Aye Captain.
As I see it:
1. There are two distinct sexual practices, procreational and recreational.
2. Religions are naive creation and existence hypotheses that played a significant role in the development of modern human society.
3. Marriage is a consequence of the above, but is nonetheless, wholly conceptual.
4. Sexual activity can be both healthy and unhealthy depending upon circumstance...The biggest threat being pathogenic infections.
5. What is regarded as safe sex or clean sex can be both physically and mentally rewarding...And protected sex obviously avoids unwanted pregnancy and all it's ramifications.
6. Realistically, sex both procreational and recreational can be practised by any two or more unmarried or married people.
7. I think that it's fair to say that the biggest cause of "Porn" is religion and religious attempts to suppress human nature...All based upon the stupid notion that inherent necessity is sinful in the mind of a make believe creator.
8. Even if there is a creator, it therefore created us as sexual and wantonly procreational beings...It was daft men who came up with all the daft religion based ideas such as sin and marriage, just a few hundred years ago...Though I would suggest that marriage was formerly more of a financial contract between families.
9. Porn as simply a sexual stimulant or entertainment is not unhealthy...Which isn't to suggest that certain detrimental aspects of the wider "Porn Industry" can be flippantly dismissed.
10. And then there is prostitution.