In preparation for marriage, teach your son that sex is about intimacy and interpersonal communication, not just physical function. He may be made anxious by premarital instruction that often emphasizes goals and performance. Explain that while marital sex is sanctioned, boundaries still must be respected. Most importantly, encourage him to stay mindful, present and connected to his partner, and rather than focus on achieving goals, appreciate and enjoy the journey they are about to embark upon together.
Talli Rosenbaum, “Ten tips for raising sexually healthy Orthodox sons”, The Times of Israel (27 November 2014) [http://blogs.timesofisrael.com/ten-tips-for-raising-sexually-healthy-orthodox-sons/]