I thought this article was helpful, if still a little bit off.
It’s true that putting a lot of emphasis on “sexual compatibility” by trying out a lot of partners before marriage will probably result a more interesting time in the bedroom after marriage. And, as a corollary, is no method at all for ensuring a long-lasting marriage, or preventing divorce. Similarly, It should be obvious as the day that people who pick up tips and tricks from multiple partners will acquire more skill in the physical act than people who abstain until marriage, and never wander after.
Rachel Pietka’s answer is 100% correct, if only half-way there. She points out that not having sex like a pro isn’t a bug, but a feature of marriage, because marriage isn’t primarily about the quality of your sex life. It’s about honoring God by making a family. Good sex isn’t God, and it shouldn’t be an idol in your life. So Christian marriage says something by not placing sex first.
All to the good. But may I point out that “like a porn star” is probably a pretty awful definition of “good sex” to begin with. In a Christian marriage, part of the loyalty of love that you show there is in caring for someone who is very much different from you, tending to their needs especially when it isn’t convenient, and when it goes against all your own preferences. If that kind of love can’t be demonstrated in the marriage bed, what good is it at all?