I used to listen to Dr Laura (and Susan Powter and Tom Leykis) because even though I frequently didn't agree with her (or Tom), I liked the questions they brought up and it challenged me to verbally come up with responses when I was very human-contact deprived.
One thing I remember hearing on her show was a similar situation where the mom sat down and looked at the photos with her son and said, "This is someone's daughter. This is someone's sister. etc." That level of wording might get through to an 11yo more than lectures about "objectification".
We have a small amount of sex books, purposefully chosen for their respectfulness of equal partnership, and emphasis on caring for your partner and showing respect. We keep them on the shelf with all the other books. I figure when they want to know more about sex than mom tells them, they'll find them.
I actually brought one out the other day when ds1 hit ds2 in the testicles and we had a talk about why private parts are called private and I ended with a joke about "and I want grandkids". He didn't really get it, so I took down the sex book and we looked at the anatomical pictures of where sperm gets produced and why the testicles relate to having children.
For right now though we're good... ds1 was watching a commercial with all these women in bikinis, "I don't get it, all these girls and how come only one guy?"

we're not far away though...
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