Lack of intimacy can be harmone related.A lot of spouses who are in long term marriages are lacking knowledge of female physiology,I think.They complain about less sex or lack of it when wives are in their 50s,60s,or70s.They feel rejected when sex is denied and complain wives donot love them anymore. LOVE=SEX on overdrive,they think.unfortunately it's not that women fall out of love.its that sex can be painful sometimes. I agree sex is important.But rather than handling situations with compassion they decide they have a right to cheat.Sad business.