When people talk together, equal airtime creates a relationship in which both people count. Same with the symetrical, or non-symetrical, pleasuring of sex.
When people talk together, being considerate of the other person's likes and interests leads them to enjoy talking together. In sex too, responsivity to indications of what the other person enjoys or prefers to avoid matters, hugely.
When people talk together, if he listens when she talks, enjoying the conversation by finding what's interesting in what she says, and vice versa, odds are good that these folks will enjoy being together. Similarly, both partners in sexual activity need to be open to receiving what the other offers.
When people talk together, it's hard to both talk and listen at the same time. Same thing in sex. Best when one person is doing and the other receiving. On the other hand, singing together is fun. In the higher intensity later phases of sexual intercourse, both partners can be active if they move in harmony with each other.
When people talk together, if it's all about one of them, that's narcissism coupled with excessive altruism. Another word for excessive altrusism is enabling, or co-dependency to describe when the other goes along with the inbalance. In sexual interactions, if one person gets all the attention, there's similar narcissism and excessive altruism/enabling/co-dependcy.
When people talk together, if one tells the other what to do, that gets old quite quickly. That's controlling behavior, and takes the fun out of a relationship. Same in sex.
When people talk together, criticizing each other puts toxicity and negative energy in a relationship, tarnishing love. Any criticism of a sexual partner is sure to poison the relationship, and the sexual enjoyment, probably for both.
By contrast, sharing information in the form of feedback ("I get anxious, uncomfortable, etc when you ...) is vital. So is gratitude, enthusiasm, and appreciation.
May all your intercourse, verbal and physical, be loving...
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Susan Heitler, Ph.D. is author of the website PowerOfTwoMarriage.com, which teaches the skills for relationship success.