There is a plethora of different reasons ranging from his emotional attachment to you, to the sensations he feels.
You could be doing something different. It could be relative as well. Does he count foreplay? With myself if there is a lot of foreplay then the actual penetration doesn't last too long. That has more to do with mental stimulation I think.
I don't know what the reason could be. Does he use condoms with the other women? Is it just his word you're going by? I suppose getting empirical evidence is out of the question.
You both you and you're on again off again boyfriend enjoy it then I wouldn't spend too much time thinking about it. Just enjoy the moment. Unless this is his way of saying that he isn't satisfied. If that is the case then you need to talk to him more.
So... just a question, why is he on again and off again instead of full on?
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