Rather than trying to figure out all the different components of how to make love last, focus instead on creating an atmosphere of respect with your partner. The more you can do this, the more other vital elements of the relationship, like trust, intimacy, passion, love, and so on, will naturally flourish.
I've learned a lot of lessons in my relatively short, 12 years of marriage; the usuals -- like not saying the "D" word, accepting that my husband doesn't always flush the toilet, and that throwing wooden spoons at walls while cooking makes more work for me than trying to prove how mad I was. But there are a few important lessons I've learned (mostly the hard way) that have truly helped save my marriage countless times.
In 2015, women shouldn't be held to a higher standard than men in keeping themselves attractive; they should, naturally, be valued for more than their appearance. On the other hand, in 2015, all people in their rightful convictions might strive to be just a little more flexible -- as flexible, say, as an elastic waistband.