That's what a lot of people don't understand about sin's. They think....oh, those are to restrict my freedom and fun. Nope. They're to make your life much better, as well as others in the long run. Imagine how much better her life would be right now with a loving partner family man to look after her and her kids. It would be beautiful (as intended) People would rather lust and rush into someone they're not truly chemically compatible with though and once the novelty of the sex wears off....you're not left with what you should of had.
The tricky part about sin is you only get to see much of the benefits in hindsight or when you gain wisdom. So I can't blame people for falling victim to temptation....but try to learn from observation rather than direct experience if you can.