Welp, he's just repeating what his church or whatever says. Casual sex works great for some people, not so much for others. Some people can tell what works for them, others have to go find out what they like best.

But one thing it is not: psychological destructive. Bad people in your life can be though. Like people who confidently state that kind of #####t. Exposure to ######t I suppose you could consider cumulative.