This myth is true only for 15 percent of the people, and many number of factors are associated with it like timing, mood, stress, the amount of foreplay, etc. Rather than postponing your sex for the above reasons, try to have sex when you can and don't interpret an off night as a sign of a failing relationship. To keep things exciting, try to have sex with new positions and locations.
Second myth: The best sex is spontaneous
Expecting sex to just happen at the spur-of-the-moment can lead to long dry spells, whereas writing it in on the calendar is a show of commitment; plus, it gives the couple something to anticipate. A couple should establish a weekly time for intimacy, meaning anything from sex to cuddling. Devoting that time will help the couple to get the thoughts of the eagerly anticipated first dates.
Third myth: Couple should have sex three times a week
Having sex regularly nourishes the relationship. But couple should not always keep the count - as most happy couples don't have sex everyday or even two or three times a week. The most important thing is that both the couple should be satisfied with the frequency. And remember: There's more to a healthy sex life than just sex. Try to create intimacy by cuddling, holding hands, and spontaneously hugging and kissing.
Fourth myth: Good sex is long and slow
Only few people can afford the luxury of leisurely sex. In fact, more people think that it's more work after an exhausting day, and holding out for the ideal movement can lead to infrequent or even worse, vacation-only sex.