Yes, you are right. A lack of sexual intimacy will lead to divorce because sexual fulfilment is is a core emotional need for most men. Although some women crave it more than their husbands, it's never always the norm. It's always advised that couples have sexual agreements and stick to it during marriage. And sex should be an avenue for both partners to serve themselves by going in with the mentality to please each other sexually.
P.S; I'm sorry for the late reply to your comment.