How very exciting for you both! I’m sure he’ll be open to it. As a man myself, I’ve never been turned off by my wife letting me know that she experimented with something, in fact it’s a great foreplay. Not exactly the same, but I’ve got several examples top of mind where we met up for sex and she shared she had recently masturbated (once where we had a plan to meet up for a child-free afternoon and she shared she’d gotten so turned on while reading and waiting for me she’d masturbated and already cum twice before we got it on kinky-like; another where she came to bed late after working late on a project and I woke and asked for sex and she shared she’d banged out an orgasm before coming up to try not to wake me). So anyway, your hubby sounds like an open guy and I can’t imagine it would go wrong as you get together to share “hey, I tried something new today…”
If you’re still a little nervous that he’d have some issue with it for any reason, introducing it as “I read an article/sexy story/had a dream…” and judge the reaction there. I’m always in favor of leading to full honesty one way or another…
With partnered anal play there’s a wide variety of ways to introduce and engage in it gradually, such as smaller plugs or slim dildos in the butt with vaginal intercourse. That can be a much less intimidating way to get into it. If the anal toy is vibrating that can be an amazing feeling on the penis through the vaginal walls, too.
Our anal progression was pretty gradual with multiple attempts that were pretty “meh” - first experimented with anal beads around 2011, a plug about 2013, tried anal for the first time on Valentine’s Day 2014 and was not impressive for either of us and put it to bed for few years. In 2017 when my wife was pregnant with #2 (no pun intended) her libido skyrocketed in the second trimester and she started asking for anal with a dildo vaginally for DP. Her take for a long time became “if something’s in my ass, I want it to be you enjoying me.”
For the first while she identified that anal was uncomfortable, bordering on pain, but that she loved the taboo so much it overcame the discomfort. Over time it became tolerable to mildly uncomfortable and eventually got to the fully pleasurable state (probably since 2020) and it’s been a regularly requested/invited part of our repertoire for the last several years. She still prefers my penis anally and a good-sized dildo vaginally with her Womanizer/Melt on her clit for the full effect. She’s not much of a size queen and prefers our old-faithful 6" dildo for DP. I’m a fan of using the bigger ones as it’s more for me to hold onto and help thrust and I love feeling it in and out from the other side.
Friendly reminder and co-sign on previous comments advising to stick with flared base/designed for anal toys to prevent anything getting sucked up and requiring medical intervention.
And just from another dude’s perspective, there’s no need to use an enema or anal douche to prep. You can if you want, but listen to your body for whether it’s a good time to play or not. By all means, give a little attention to cleaning your backside if you know it’s coming or you are planning to receive any rimming. But we know what we’re getting into and if poop happens, poop happens. I’ve never pulled my cock out of my wife’s ass after an amazing time DP-ing her and regretted my life choices because of a little poop on my dick. Come on.