Why do men act differently during sex with different women? /u/neen1299 Sex

I (23F) recently became Eskimo sisters with a close friend and while comparing notes we were a little shocked at how different he was with both of us. Both were one night stands with zero emotional attachment involved so that isn’t relevant. Some differences in positions which could be chalked up to our very different body types (i.e. spending much more time in doggy since I have a bigger ass haha). What was most shocking was that he was a LOT more aggressive with me- biting, slapping, just generally more rough (I have quite a few bruises to show for it) while this didn’t happen with the friend. I don’t mind being rough but I don’t usually initiate things like this. I’d say me and my friend have similar personalities so I don’t think we’d give off very different impressions?

Any men have insight into why you might act differently with different people?

I (23F) recently became Eskimo sisters with a close friend and while comparing notes we were a little shocked at how different he was with both of us. Both were one night stands with zero emotional attachment involved so that isn’t relevant. Some differences in positions which could be chalked up to our very different body types (i.e. spending much more time in doggy since I have a bigger ass haha). What was most shocking was that he was a LOT more aggressive with me- biting, slapping, just generally more rough (I have quite a few bruises to show for it) while this didn’t happen with the friend. I don’t mind being rough but I don’t usually initiate things like this. I’d say me and my friend have similar personalities so I don’t think we’d give off very different impressions?

Any men have insight into why you might act differently with different people?