Been together a long time.
He's early 40s, I'm early 30s. DC but not at the demanding ages. He drinks between 4-6 cans most nights which I bring up but I know he won't change that.
In the past year, I've noticed he has been less adventurous in sex. He still initiates quite often but equally if he's working away, he doesn't seem bothered or mention on the phone he misses it or anything. It's become mostly quickies and sometimes feels a little like he's doing it 'for me' or maybe because the frequency is kind of expected after being consistent for many years.
I never overtly initiate, I just never have, it's not me. I'll go up and kiss his neck etc to signal, but I've always left it up to the partner to take it forward or not. It's a rejection fear on my part I think.
Me on the other hand, my drive seems to be increasing in my 30s.
Today he brought up (I didn't ask) he thinks he's 'slowing down' in that area, said he used to masturbate every other day but now rarely can be bothered and just waits/looks forward until we get the chance to do it. And he doesn't get the urge again until about at least 5 days after each time. Said jokingly 'im past my prime and it's probably only going to get worse' . It's weird the way he brought it up in a humorous way. He sounded a bit nervous.
Don't get me wrong, he very obviously still enjoys it.
I'm sad though. Sex is a big part of our connection, and my drive has just ramped up since I turned 30!! My ideal would be every other day most of the time and at some days in my cycle, three times a day.
I feel sad that having been together since my teens, I'm just getting into my stride and he's 'winding down' 
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If you've got this far, is there anything that can be done..