Hello. How would people feel if they found out that their partner had visited dominatrices in their past, while they were single? There was no physical sexual relief.
The relationship is conventional (vanilla), satisfying and healthy. There is no intent to revisit these activities within the relationship or with anyone else.
Would knowledge of his past behaviour change your view of them or change the relationship, inc LTB?
Finally, would you expect his past to have been shared with you at an early stage of the relationship or to be none of your business?