I find having sex can actually help a relationship and if a sex therapist can bump how often you have sex that can help a lot. Btw I'm not suggesting you need to have sex like every day or else your marriage is doomed but like once a week or at least once a month can help.
sex / intimacy is essential to a healthy marriage, its basically physical communication and just the same as verbal communication, without the relationship is doomed in the long run
you can make it work sure but if you last as a couple is just a bit less likely...someone is not going to be satisfied and frustration eats at the relationship as time passes.
now im not somekind of expert, just speaking from my own experiences and observations 🤷♂️