This is an interesting topic. Most times I see the answer, "No, it is not." However, it is more intimate so it can be a gateway for sexual contact. Therefore, it may be best avoided before marriage. Especially since we are all capable of getting carried away in the moment. Might I recommend the book Dating Delilah by Judah Smith? There is also a workboom for this book. It was a good and insightful read about Christian courtship.