Read other letters about this article
Many Orthodox Jews are what is called shomer negiah, literally, observant of touch. They do not touch anyone of the opposite sex outside of their immediate family. Spouses only touch for the first time after marriage. No touching before that. No kissing, no holding hands, nothing.
These are also the Orthodox communities that tend to have arranged marriages, to one degree or another. I'm amused that the Christians have now caught on.