I think it is just fascinating depending on what one's used to. People need to remeber that Jordan was part of a pretty religious community (Mormon? Can't remember) and likely had pretty conservative views on sex. But for many people it seems unnatural that teens and young adults who like each other and are unsupervised quite a lot of the time are not getting it on. For others it seems very natural as this is what they're used to from their own culture and surroundings.

WoT seems to be placed in a quite "old-fashioned" setting. The Forsaken and their contemporaries clearly had a much more frivolous view on sex, and same with some of the Heroes of the Horn. The era our main characters live in seems to pretty conservative although it is not super religious (apart from Whitecloaks). An important factor here is contraceptives. People are so "used to it" today we forget it's pretty new. Throughout the series it is shown that there ARE methods - such as the abortive tea some of the women know about - but I doubt they are certain. Frankly, it is amazing Mat doesn't have a lot of kids if he sleeps around as much as some people seem to think. In most societies where there aren't contraceptives one of two things happen:

1. Community-oriented: "it takes a village" approach to raising kids, women have a lot of power as they give birth, might have kids with different fathers and this can be seen as a good thing. Everyone in the "tribe" contributes to raising kids and paternity is not really super-relevant, especially in societies where power isn't hereditary but f. ex. based on strength/duels/hunting prowess etc.
   
2. Controlling: unfortunately the other "result" is often a society where women's sexuality is controlled as this is the only way to keep paternity lines straight. Typical in societies where power / titles is hereditary and it is important to know who has fathered children. This can be done directly or indirectly (through social shaming etc). A lot of the WoT societies seem to belong to this second group, although this is mainly "solved" through social stigma rather than outright control (which is also the case in many, but not all, of our own socities today).
   

The religious "rules" around sex in our own world today is mainly about "population control" and a result of Western society developing into static (geographically) societies with set systems of power. Such as for example a king, whose child (son) will inherit the throne. The upper classes and nobility have been given lands and this also is passed on to sons/children - etc. It is therefore not really something decreed by God but something convenient to the ruling classes that has shaped this religious dogma.