Staying hard during intercourse...help

I've read a few Q&A's about this subject, but I think mine
is a different situation. My boyfriend is great in bed,
but he has trouble staying hard throughout intercourse.
I've been with other men that can stay hard all night long,
so this gets a little frustrating at times and limits what
we can try. I don't think it's a nervous thing, since we've
been together for several months now. Can anyone offer
advice as to why this happens and how to stay hard as long
as possible? Thanks

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