There is a saying, "An ice-cream parlour that gives away free lollies will attract a lot of people, but at the end of the day when it goes up for sale, nobody will want to buy it."
I have pointed out girls who use their bodies and their sexuality to get what they want from a guy... and the guys will usually just say it's not a bad thing..! Or that's what they think... personally I think it is bad for a woman to use this weakness of a man to get what she wants from him. Also, it is not good for the man to give in as it will always lead to adultery, whether actually physically or even just in thought.
I do not believe the Lord God gives us rules just to "make our lives miserable". I have a friend who does not believe that good and bad really exist and the only reason he doesn't kill people whom he doesn't like is because he'd get into trouble for it! I believe that if God tells us not to do something, it is because it would be better for us not to do it. Sometimes we don't see why God tells us not to do something as His reasoning isn't always obvious to us humans. We just have to trust what He says.